Showing papers by "3M published in 1968"

Biodegradable radioactive particles

Abstract: Particles, preferably substantially spherical particles having a smooth outer surface and essentially void-free interior are produced, consisting essentially of solid, cold-water insoluble vehicle comprising a physiologically acceptable, parenterally metabolizable protein or polysaccharide having dispersed therein a water-insoluble carrier loaded with radioisotopes, which are substantially non-leachable upon short term exposure to cold water. Such particles can be administered parenterally for diagnostic purposes, or for treatment with radioactive materials. On administration in this way, they are broken down or solubilized by the body fluids over a predeterminable period ranging from minutes to several days, whereupon the radioisotopic material is excreted from the body thus limiting exposure to the radiation.

Atomizing method and apparatus

Abstract: A method for atomizing a liquid which comprises the steps of (1) forming a dispersion of minute gas bubbles in a flowing enclosed pressurized liquid, said liquid and gas being the continuous and dispersed phases respectively, and (2) subsequently forcibly expelling the dispersed system through an hydraulic atomizing nozzle into an ambient atmosphere to provide an expanding stream of minute droplets. The preferred apparatus for carrying out the method of the invention is a venturi tube fitted at one end with an hydraulic atomizing nozzle, the compressed gas being introduced into the liquid at the throat of the venturi.

Masking tape and masking paper applicator

Abstract: A MASKING TAPE AND MASKING PAPER APPLICATOR FOR MANUAL APPLICATION OF MASKING TAPE AND/OR MASKING PAPER COMPRISING A HANDLE FRAME AND A ROLLER FRAME HAVING COMMON SPRING MEANS FOR CONNECTING THE HANDLE FRAME AND THE ROLLER FRAME TOGETHER, THE ROLLER FRAME BEING ADAPTED TO CARRY A ROLL OF MASKING TAPE AND THE HANDLE FRAME CARRYING A TAPE APPLICATOR ROLLER IN ROTATABLY MOUNTED RELATION THEREON, THE APPLICATOR ROLLER HAVING AN ENLARGED BORE MOUNTED ON A SUBSTANTIALLY SMALLER AXLE CARRIED BY THE HANDLE FRAME SO THAT SPRING MEANS TENDING TO MOVE THE ROLLER FRAME TOWARD THE APPLICATOR ROLLER MAY FORCE THE ROLLER TO MOVE LATERALLY WITH RELATION TO THE AXLE ON WHICH THE ENLARGED BORE IS MOUNTED AND WHEREBY PRESSURE OF THE APPLICATOR ROLLER ON A SURFACE WHEN APPLYING TAPE PERMITS THE ROLLER TO MOVE RELATIVE TO THE AXLE IN A DIRECTION AT RIGHT ANGLES THERETO AND TO DEFLECT THE ROLL OF TAPE AND THE ROLLER FRAME RESILIENTLY RELATIVE TO THE HANDLE FRAME.

Biodegradable radioactive polysaccharide particles

Abstract: Particles, preferably substantially spherical particles having a smooth outer surface, consisting essentially of solid, cold-water insoluble vehicle comprising a physiologically acceptable, parenterally metabolizable radioactive polysaccharide, said particles being substantially non-leachable upon short term exposure to cold water. The particles can be administered parenterally for diagnositc, prophylactic or therapeutic purposes. On administration in this way, they are broken down or solubilized by the body fluids over a predeterminable period ranging from minutes to several days, whereupon the radioisotopic material is excreted from the body thus limiting exposure to the radiation.

N-acylated perfluoroalkanesulfonamides

Abstract: This invention relates to certain N-acyl aliphatic sulfonamides and salts thereof which are active as herbicides. Many of the compounds of this invention are also physiologically active as diuretics and/or anticonvulsants. Processes for the preparation of the compounds and compositions for horticultural use containing these compounds are described.

Spring-powered preloaded camera

Abstract: A camera preloaded with film and having a pretensioned spring drive means by which film is advanced through the camera. In one embodiment, the preloaded film is stored in a supply roll, stretched across the camera''s picture-taking light path, and attached to a take-up spool; a pretensioned spring is coaxial with the take-up spool and biases the take-up spool toward filmadvancing rotation; at least one stop is formed on the take-up spool; and a stop lever is normally in the path of the stop on the spool to hold the spool against film-advancing rotation, but the stop lever is pivotable out of the path of the stop by camera-actuating means to temporarily release the spool for filmadvancing rotation.

Arrhythmia recording and control system and method of operation

Abstract: An electrocardiographic signal is continuously displayed in a series of consecutive horizontal traces on the face of a cathoderay tube with each trace being vertically offset from the preceding trace in response to a sequentially stepped reference signal applied with the electrocardiographic signal to the cathode-ray tube vertical deflection amplifier. The cathode-ray tube display is photographed onto one quadrant of a 35 millimeter microfilm.

Dual hub assembly for reels

Abstract: An assembly for mounting in an opening in a panel to drive two reels reversibly for driving a magnetic recording tape reversibly comprises: a spool-shaped housing attachable to the rear of the panel; two coaxial shafts extending through the housing and the opening in the panel; two coaxial hubs on the front ends of the two shafts, respectively; outer circumferential elastomeric rings on the two hubs respectively; screw means incorporated in the two hubs, respectively, to compress the corresponding elastomeric rings for radial bulging of the rings into binding engagement with the two corresponding reels; two motors on the rear end of the housing to drive the two coaxial shafts respectively; two electrically actuated brakes adapted when deenergized to retard the two coaxial shafts respectively; and two oppositely oriented one-way clutches connecting the two brakes to the respective shafts so that when the power supply fails with resultant deenergization of the two motors and the two brakes, the brake for whichever reel is functioning as a supply reel retards the supply reel with the other takeup reel freewheeling.

Binaural and method of making the same

Abstract: A stethoscope method of making a stethoscope binaural from an elongated resilient tubular member preferably having a symmetrical cross section comprising sliding a tubular T-shaped yoke onto the tubular member, then bending and setting the tubular member and T-shaped yoke in a jig into a substantially symmetrical U-shaped having two legs and a bight with one leg and the adjacent portion of the bight lying substantially in one plane and the other leg in its adjacent portion of the bight lying in a second plane intersecting the first at an angle of 150* . A hole is formed in the tubular member through the base of the T-shaped yoke and a tubular retaining pin is inserted. A tube is then connected to the tubular pin of the binaural. In a preferred structure of the binaural there is provided a tubular homogenous mass of plastic having a cross-sectional configuration in which the thickness of the tubular wall is greater in a direction normal to the major plane of the stethoscope and in which the binaural is provided with a pair of legs and an interconnecting bight section continuous and integral with one another with the legs resiliently urged toward a normal untensioned position by the characteristics of the plastic material. A generally T-shaped member having a channel in the crossmember of the T and a tubular stem engages the bight of the binaural and provides means for connecting a flexible tube in turn connected to a chest piece.

Method of applying an adhesive mounting material

Abstract: A method of applying a mounting material having pressuresensitive adhesive on two opposed faces to a preformed emblem having a mounting surface and at least one rib which protrudes from the border of the mounting surface. The method comprises the steps of placing a preformed emblem formed with ribs on one of the pressure-sensitive adhesive-coated faces of a strip of mounting material and applying pressure to the emblem sufficient to force the ribs through the mounting material and adhere the coated face of the severed mounting material on which the ribs of the article are placed to the mounting surface of the emblem.

Magnetic electrical connector for a food preparation system

Abstract: This invention is directed to magnetic electric connectors. Each connector is composed of at least two units. The first unit is comprised of a nonconductive permanent magnet partially encased by electrically conductive contact plates bonded or form fitted to the magnet. The second unit may be of similar construction or conversely comprise a magnetically permeable electrically conductive platen of desired configuration. When connected, the contact plates of two similar units or the contact plates of one unit and the magnetically permeable platen contact each other and act as electrical conductors. The units are held together by magnetic attraction. The juncture of the plates or the platen and plates forms an electrically conductive connection so that current from a power source connected to one unit can pass to a load connected to the other unit. Either or both units can be integrally formed with electrical appliances, devices, etc.

EMI shielding with electrically conductive pressure sensitive tapes

Abstract: The increase in importance of effective EMI (electromagnetic interference) shielding is obvious from the ever increasing space devoted to this problem in technical journals. The required attention to the shielding aspects of design, of components and equipments, has become a significant part of manufacturing costs. This paper describes a new tool or tools to assist the design engineer in overcoming the problem of RF leakage. Pressure sensitive tapes with metal for backing have been available for some years and these do provide a limited degree of shielding. More recently metal foil tapes that are electrically conductive through, rather than just along the tape, have become available. These increase the utility of the metal foil backing in shielding applications by a factor of 100 +, because they now provide a mechanism for direct conductivity from a metal surface to the tape backing.

Pinhole Test for Dental Adhesion

Abstract: By withdrawing a stainless steel pin embedded in a tapered pinhole in a bovine tooth, adhesion values for experimental materials may be measured with acccuracy satisfactory for screening purposes. For some bisphenol A-glycidyl methacrylate adducts with fillers, forces of 750 to 1,450 psi were recorded.

Producing a retroreflective coating

Abstract: Producing a retroreflective coating Useful for sign-posts, fence-poles, etc., the coating is produced by; (a) applying a film of material consisting of 10-100% of microscopic glass spheres with a refractive index of 1.7-2.7 and a dia. of 15-85 mu, and 5-45% of a film-forming, non-volatile binder; (b) drying the film below the decomposition temp. of the non-volatile component so that the film assumes a lenticular appearance; (c) treating the surface with a caustic soln. with a pH of 5-9 until metal is removed from the lenticular exterior of the surface, and (d) washing the caustic soln. from the exposed exterior of the film.

Apparatus for heat shrinking tubing about objects

Abstract: A process is taught for fixing shrinkable tubing about objects. The process includes cutting a section from an advanced end of shrinkable tubing, conveying the discrete section sequentially and in spaced and oriented condition to an object-receiving station, inserting an object therein, and shrinking the tube section about the object. Tube section encompassed objects formed by this process are also taught. Apparatus arrangements are also set forth; and these include an indexing holder assembly of tube section holders, an indexing body assembly of mandrels adapted to receive cut sections of shrinkable tubing and transfer them into tube section holders of the holder assembly, an indexing selector feed mechanism for conveyance of objects into position for insertion into tube sections hold by the indexing holder assembly, plus means to shrink sections of tubing about objects therein, ;and then means to eject tube-encompassed objects from the indexing holder assembly.

Lithographic duplicating method and lithoplate master therefor

Abstract: A high quality long run lithographic-printing plate is produced by applying an alpha-naphthol first reactant at image areas to a lithoplate master containing an ionic iodide coreactant, most particularly a quaternary ammonium iodide coreactant, and heating the plate.

Frame useful as lens support

Abstract: Undercut framelike members, e.g. lens holders, which are produced by casting in two-piece single-draw injection molds, have an inner undercut groove tapering from maximum depth at one centerline to zero depth at the centerline perpendicular thereto and provide for stable support and easy removal of the lens.