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William F. Semple, a dentist, was awarded the first US Patent on chewing gum in 1869. His recipe contained powdered chalk.
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| Number | Title | Issue Date |
| 4180357 | Apparatus and method for perforating tubing and method of producing part of such apparatus Corrugated tubing is advanced along its axial path by rotatably driven lead screw members the screw threading of which is in meshing engagement with the corrugations of the tubing, the lead screw members being in pairs with the screw threading of the memb... | 12/25/1979 |
| 4176835 | Sit-up exercising device An exercising device for assisting in sit-up and leg-raising exercises has a frame with a flange adapted to be trapped beneath a door, the frame supporting a resilient foot engaging roller with shaft extensions which form hand grips. Hand grips extend out... | 12/04/1979 |
| 4176610 | Safe deposit apparatus In a safe deposit apparatus of the type having a horizontally pivoted sector-shaped door with an interior pocket formed by a pivoted wall serving to eject articles from the pocket when the door is closed, the pivoted wall is normally biassed to the pocket... | 12/04/1979 |
| 4174624 | Tank for explosive forming A water-filled cylindrical tank is provided for explosive forming with improved means to damp ringing and to cushion shocks due to explosions within the tank. Damping is by means of an annular disc connected within the open top of the tank by rubber-in-sh... | 11/20/1979 |
| 4172535 | Control apparatus for a pneumatically-operated hopper feeder The operation of a vacuum-conveying hopper feeder is controlled using pneumatic logic circuitry including a leak sensor relay providing improved control accuracy and with a sensor orifice which becomes occluded by a spring-loaded plunger when the feeder b... | 10/30/1979 |
| 4169447 | Starting system for compression ignition engine A starting system for a compression ignition engine includes an auxiliary engine in combination with a conventional cranking motor arranged so that either the auxiliary engine or the cranking motor may be used for starting, or both may be used in tandem. ... | 10/02/1979 |
| 4168640 | Expanded foil cutting method The cutting of masses composed of multiple thickness of expanded foil is accomplished using reciprocating toothed blades that are deeply notched so that the strands of the expanded mesh enter deeply into the notches and are sheared through between the tee... | 09/25/1979 |
| 4167177 | Fireplaces A fireplace has an imperforate dished fire-pan, the sloping sides of which support the fire, which radiates through an opening in the wall of a conical enclosure superposed on the fire-pan. An outer frustoconical casing in most cases surrounds the enclosu... | 09/11/1979 |
| 4165214 | Apparatus for producing corrugated thermoplastic tubing In order, in the molding of corrugated thermoplastic tubing, to overcome the disadvantage that pressurized air which is supplied to a zone within the tube of thermoplastic material as it is extruded from an extrusion head into the entrance of a tubular mo... | 08/21/1979 |
| 4161842 | Traps for animals The invention seeks to provide a humane trap which dispatches trapped animals without pain or panic. A peripheral trap frame, open on one side, has sides on either side of the open side spring urged towards one another to provide the motive power for a pa... | 07/24/1979 |
| 4159753 | Cruise control device for vehicles A speed control device for a vehicle driven by an internal combustion engine comprises a longitudinally movable actuator member connected to the accelerator control linkage of the engine, a longitudinally movable abutment member, a device for optionally l... | 07/03/1979 |
| 4157661 | Flowmeters An inclined plate type flowmeter measures the horizontal reaction resulting from solids striking the plate by using strain gauges to detect deflection of a beam supporting the plate. The difference of the outputs of two such flowmeters at the top and bott... | 06/12/1979 |
| 4149649 | Explosion-suppressive masses An explosive-suppressive mass comprises layers of expanded metal of which each layer is arranged in a selected orientation so that its mesh strands are inclined with respect to the mesh strands of the layers adjacent thereto. This gives economic and other... | 04/17/1979 |
| 4147231 | Ladder stabilizing device A stablizing device to be connected on the outer sides of the side pieces of a ladder has a lower leg pivoted on a lower part of the side piece and pivoted at its upper end to an upper leg part which has a locking member for releasable locking on the side... | 04/03/1979 |
| 4146131 | Food processor tool holder A holder is provided for the tools of a food processing machine, the tools being of the kind which have stems that can be driven by a food processor motor, with cutting or other active elements radial to the stems. The holder includes a plurality of panel... | 03/27/1979 |
| 4145349 | Process for the production of saccharine This invention relates to a process of producing saccharin by reacting o-chlorobenzoic acid with sodium sulfite, esterifying it with methanol, and then treating the o-sulfobenzoic acid methyl ester with thionyl chloride as a chlorinating agent, the improv... | 03/20/1979 |
| 4144624 | Machine for expanding metal webs An expander machine for expanding rotary slit metal webs is of the type having mutually inclined triangular expander arms over which the web is passed forwardly to spread the web and open out the slits to form diamond-shaped meshes. The angle between the ... | 03/20/1979 |
| 4141576 | Heat shrinkable sleeve for coupling pipe sections Pipe sections are coupled end to end by shrinking a heat shrinkable sleeve in frictional engagement with the end portions of the pipe sections. In a preferred application of the invention, the pipe sections are corrugated and the sleeve conforms to the co... | 02/27/1979 |
| 4139430 | Process of electrodeposition and product utilizing a reusable integrated cathode unit A reusable integrated cathode unit and an associated electrolytic method are disclosed for the simultaneous production of a multiplicity of metal electrodeposits by plating from a base metal electrolyte. The rigid cathode unit has two integrated component... | 02/13/1979 |
| 4136143 | Apparatus for and method of producing corrugated thermoplastic tubing In order, in the molding of corrugated thermoplastic tubing, to overcome the disadvantage that pressurized air which is supplied to a zone within the tube of thermoplastic material as it is extruded from an extrusion head into the entrance of a tubular mo... | 01/23/1979 |
| 4129236 | Container with spout connection Spout for a container, e.g. a gasoline can, is formed as a one-piece plastics moulding with a flared skirt on the base formed with a circumferential groove that snap-couples tightly onto a bead on a raised metal neck on the can. A screw-threaded locking c... | 12/12/1978 |
| 4126425 | Gas mixer for sublimation purposes A gas mixer is disclosed which is used for mixing different gases in order to obtain a solid by sublimation or chemical reaction. The mixing is carried out in a mixing chamber having a uniform, substantially circular, cross section and a length depending ... | 11/21/1978 |
| 4124842 | Morse code signalling device A portable signalling unit includes a gas discharge tube and a continuously cycling drive circuit which produces successive discharges through the tube, a control instrumentality being provided whereby the continuously cycling of the circuit may be overri... | 11/07/1978 |
| 4117773 | Ventilation system for the supply of air or exhaustion of fumes An improved trunking system is provided for ventilation systems in which air or fumes are to be supplied to or exhausted in adverse environments from travelling equipment such as crane cabs and fume hoods in steel works and coke ovens. The trunking is of ... | 10/03/1978 |
| 4117310 | Electrical socket An improved socket assembly is described for plug-in heating elements for stove tops, in which a guide sleeve includes inwardly projecting shelves which engage a grounding member on the element and prevent it from being lowered to a horizontal position in... | 09/26/1978 |
| 4112959 | Adjustable check valve A smoothly acting adjustable fluid flow check valve comprises an adjustably spring biased ball valve member, a piston upstream of the ball valve member and having a stem acting as an actuator for the ball valve member and as a further valving member actua... | 09/12/1978 |
| 4082641 | Reusable integrated cathode unit A reusable integrated cathode unit and an associated electrolytic method are disclosed for the simultaneous production of a multiplicity of metal electrodeposits by plating from a base metal electrolyte. The rigid cathode unit has two integrated component... | 04/04/1978 |
| 4080962 | Posture-training brace A brace for posture training comprises a thoracic band, a pelvic band resting on the base of the sacrum and arched over the hip joints and beneath the front of the hip bone, and resilient struts extending between the bands so as resiliently to oppose unde... | 03/28/1978 |
| 4070612 | Method and apparatus for measuring terrain resistivity Apparatus is provided which may be made portable and is calibrated to provide direct readings of terrain conductivity. Transmitter and receiver coils are separated by less than one tenth of the electrical skin depth in terrain having a maximum conductivit... | 01/24/1978 |
| 4064774 | Work handling apparatus for center drive lathe In a work handling apparatus for a center drive lathe having a center chuck and right hand and left hand turrets, the workpiece is accurately located with respect to the chuck, prior to machining, by means of a locating jig mounted on one of the turrets. ... | 12/27/1977 |
| 4064720 | Cylinder lock mechanisms In a cylinder lock mechanism of the type in which longitudinally movable pin tumblers are housed in a normally freely rotatable lock plug which is coupled to a locking member by means of a rocking lever responding to correct alignment of the tumblers, the... | 12/27/1977 |
| 4058167 | Fire protection apparatus Fire protection apparatus having a conduit formed internally with longitudinally continuous compartments for conveying water or fire-extinguishing gas or foam, and spray nozzles spaced along the conduit and each connected to a different compartment thereo... | 11/15/1977 |
| 4056421 | Method of fabricating crosslinked thermoplastics articles Cross-linked thermoplastics articles are fabricated by providing a radiant energy-crosslinkable thermoplastics sheet, masking areas of the sheet, exposing the masked sheet to appropriate radiant energy, fusing the masked and relatively uncrosslinked areas... | 11/01/1977 |
| 4053057 | Suspended filing folders A suspended filing folder has the top edge of one side slotted and folded around one suspension bar to accept slot-in tabs, and the other suspension bar is formed into a laminar structure with the top edge of the other side, and is embossed with a row of ... | 10/11/1977 |
| 4048970 | Fuel injector A fuel injector for a compression ignition engine comprises a fuel injection nozzle, a valve controlled fuel supply chamber located behind the injection nozzle for storing a quantity of fuel, a port for admitting fuel to the supply chamber, a fuel piston ... | 09/20/1977 |
| 4047321 | Animal trap There is provided an animal trap comprising a spiral spring which has a fixed inner end portion and a movable outer end portion and which is extendible to a stressed condition wherein the movable outer end portion of the spring is in engagement with suppo... | 09/13/1977 |
| 4046168 | Closure plugs In order to avoid the necessity of having a range of sizes of tools for the mounting and removal of a plurality of resiliently deformable plugs of different transverse dimensions on the ends of associated tubes, there is provided a plurality of such plugs... | 09/06/1977 |
| 4041394 | Radio control transmitter In order to facilitate operation of a radio remote control transmitter, the transmitter components are built into the structure of a vest-like garment, and the transmitter is operated by placing a magnet on the wrist of the user adjacent one of a number o... | 08/09/1977 |
