Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 4948846 | Inversion polymerization of vinylchloride in a reactor coated with an agent comprising a clay and a water-soluble suspending agent The polymer buildup problem that may occur in the reactor where the inversion polymerization of vinylchloride is conducted can be effectively ameliorated by way of coating the internal surfaces of the reactor with a mixture comprising an expanding lattice... | 08/14/1990 |
| 4890683 | Power steering apparatus A power steering apparatus in which a housing to contain a torque sensor for sensing seering torque, a small-sized motor for assisting steering, and a driving device for transmitting driving force of the motor to the steering shaft is made small-sized and... | 01/02/1990 |
| 4549543 | Air filtering face mask A respirator with an improved exhaust valve and a flexible face piece which conforms to the shape of the face of the wearer. The respirator is compact and principally formed of transparent material to minimize attention to the wearer.... | 10/29/1985 |
| 4373985 | Adhesive binder An adhesive binding machine which is for gluing the covers to the collated pages of the books and which includes a cutter for trimming the edges of the pages, a glue pot for applying glue to the cut edges, a nipper for pressing a cover to the glued edges ... | 02/15/1983 |
| 4373267 | Gauge calibration block An improvement to an instrument calibration block, which includes an arm member pivotally connected to the calibration block. The arm member when in its operative position positions the instrument to be tested so as to provide for a highly accurate calibr... | 02/15/1983 |
| 4365855 | Storage facility such as a file having a flexible rotatable cover A storage facility, such as a file or bookcase, which includes spaced parallel end plates supporting a brace part therebetween. A flexible cover extends between and is supported by the end plates so as to be rotatable entirely about the brace part.... | 12/28/1982 |
| 4365673 | Tiller head with shiftable blades A tiller head for a soil tilling device including a shaft which carries a number of blades which rotate with the shaft, and a drive for causing rotation of the shaft. A housing surrounds the drive. At least one of the blades is mounted for oscillatory mov... | 12/28/1982 |
| 4361247 | Self closing tank lid A safety receptacle including a tank and a lid therefor. The lid is shiftable between its open and closed positions by a linkage system connected to the lid by a linkage connector. The linkage system includes a member which overlies the lid and is connect... | 11/30/1982 |
| 4361143 | Splint for hind leg of an animal A splint for a hind leg of an animal such as a dog or cat. The splint is shaped to conform to the normal shape of the hind leg of an animal and serves to sustain the weight of the animal while walking without imposing stress upon the leg in the region of ... | 11/30/1982 |
| 4355508 | Air power motor A motor utilizing compressed air as the working fluid. Compressed air circulates from a first or high pressure tank through an air reactance member, then to pressure regulating member and to a second or intermediate pressure tank and the air reactance mem... | 10/26/1982 |
| 4353567 | Steering and suspension system for the front wheel of a three-wheeled vehicle A steering and suspension system for the front wheel of a three-wheeled vehicle in which a pair of suspension frames pivotally support the front wheel and are in turn pivotally supported for variable movement upon rotation of the vehicle's steering wheel.... | 10/12/1982 |
| 4349951 | Method of making a key ring bob A method of making a key ring bob from a shell casing and bullet head.... | 09/21/1982 |
| 4348054 | Convertible adjustable bed vehicle An adjustable, tilting vehicle bed which is power actuated and is capable of having its position selectively altered between positions in which it is flat, raised, tilted for dumping a load and tilted to provide a loading ramp.... | 09/07/1982 |
| 4346918 | Pipe spacer used in welding A split ring pipe spacer used to separate a pipe from the fitting shoulder during welding. The spacer has yieldable protrusions for the purpose of maintaining proper spacing and alignment of the pipe and fitting during welding.... | 08/31/1982 |
| 4346799 | Conveyor system with part transfer device A conveyor system having an intermediate roller conveyor section which is shiftable as a unit between an upper operative position and a lower inoperative position. An overhead conveyor extends transversely relative to the intermediate roller conveyor sect... | 08/31/1982 |
| 4345208 | Anti-falsing and zero nulling search head for a metal detector A metal detector search head which includes a transmitter wire coil and a receiver wire coil each having first and second coil sections. The first coil sections of the receiver and transmitter coils lie in substantially the same plane with the second coil... | 08/17/1982 |
| 4344456 | Pressure responsive liquid flow regulator A regulator for controlling the liquid level in a liquid supply system having a discharge part located at an elevation higher than the elevation of the regulator. The regulator is characterized by a housing spanned by a diaphragm to define two chambers in... | 08/17/1982 |
| 4341008 | Method of registering a steel rule die and counterplate A method for registering and aligning a steel rule die and counterplate. The die and counterplate each have registration holes into which a semi-permanent pin is inserted to hold the die and counterplate in alignment during positioning within a reciprocat... | 07/27/1982 |
| 4340042 | Inflatable splint An inflatable bag splint with straps which inhibits the bending of a joint. The bag is airtight with an inlet valve and the straps are situated so as to be placed about an arm or leg to prevent movement thereof.... | 07/20/1982 |
| 4337657 | Oil level gauge An oil level indicator for use on a motor vehicle having a tube open at the vehicle oil pan. An elongated stiff oil gauging wire is slidably mounted in the tube. The wire carries a float at its lower end and extends at its upper end into a stationary hous... | 07/06/1982 |
| 4337543 | Collapsible trimaran boat A trimaran type boat having center, port, and starboard elongated floats which are hinged together at corresponding juxtaposed side edges to enable the port and starboard floats to be pivoted between an operatable position in which the floats are transver... | 07/06/1982 |
| 4334630 | Hatch cover A hatch for attachment to a wall. The hatch includes a base and a cover and has interlocking pegs and grooves for securing the cover to the base.... | 06/15/1982 |
| 4334593 | Sound reproduction system A sound reproduction system having a housing with a lateral slot in the front wall thereof, one or more sound reproducing speakers located below the slot, and a plurality of resonance chambers located between the speakers forming bass, treble and mid-rang... | 06/15/1982 |
| 4332188 | Combination cooker A combination cooker for popcorn, pizza, shish kebabs, and deep frying which includes a base having a heating element therein supporting a bowl-shaped body. Either a tray or shaft-carried basket is supported by the upper rim of the bowl-shaped body of the... | 06/01/1982 |
| 4330972 | Door jamb assembly A door frame which is for mounting pre-hung doors in door openings of an existing structure and which includes an extruded metal door frame, a wooden frame for support of the extruded metal frame, fasteners which attach the wooden support frame to the ext... | 05/25/1982 |
| 4330809 | Thermal protection circuit for the die of a transistor A thermal protection circuit for the die of a transistor having a heat sink in which a signal proportional to the dissipative input current and a signal proportional to the dissipative applied voltage of the transistor are multiplied to produce a signal r... | 05/18/1982 |
| 4327620 | Slitter having pivotal multiple spaced pairs of arbors A slitter having multiple spaced pairs of arbors carried upon a rotatable housing which is shiftable as a unit toward and away from a second housing which is adapted to support a selected pair of such arbors during the slitting operation.... | 05/04/1982 |
| 4323955 | Light with 360° rotatable cover A lighting facility which includes spaced parallel end plates having a light assembly extending therebetween. A flexible cover extends between and is supported by the end plates so as to be rotatable entirely about the light assembly.... | 04/06/1982 |
| 4322610 | Recording device for golfer A recording device for computing Nassau scoring in golf. The device consists of a series of relatively rotatable score computer discs, one of which has holes receiving rotatable buttons for selective operation to compute special bets.... | 03/30/1982 |
| 4322293 | Multiple element filter In a filter for liquids including a housing which suspends multiple filtering elements and a cover. A grid is carried by the lower peripheral edge of the cover which overlies and holds the filtering elements in place when the cover is in sealing contact w... | 03/30/1982 |
| 4315803 | Baffle for alcohol stills A baffle for use in an alcohol still. The baffle is provided with a series of openings spaced and arranged to accommodate substantially even dispersion therethrough of steam at required temperature and pressure. Ribs on the baffle enhance uniformity of fl... | 02/16/1982 |
| 4314631 | Frictional belt brake A brake device which is used to prevent reverse movement of a belt run and which includes a wedge member which is pivotally supported above the belt run. Upon reverse movement of the belt run, the wedge member is drawn into pinching contact with the belt.... | 02/09/1982 |
| 4310195 | Camping trailer having a fold out body and including a frame supporting a tent A camping trailer having a fold out body in which the top of the body is hinged to the base of the body and carries a luggage rack which servs as a ground support when the trailer is opened. A frame is supported by the body in its open position and carrie... | 01/12/1982 |
| 4309189 | Method and means for producing sustained colored flames A chemical compound and the method for using it to produce and prolong colored flames. The compound contains a metallic salt and a matrix. The metallic salt produces the color and the matrix prolongs the life of that color.... | 01/05/1982 |
| 4309132 | Face mill with adjustable cutting inserts A face mill having individual, circumferentially spaced cutting inserts each individually adjustable by means of a wedging part.... | 01/05/1982 |
| 4305229 | Invertible prefabricated door A prefabricated door assembly which includes a panel, a pair of jambs and two combined header and thresholds. The jambs and combined header and thresholds form a rectangular frame into which is fitted the door panel. The panel is pivotally hinged to one o... | 12/15/1981 |
| 4303911 | Remote control digitally encoded electronic switch A transmitter is preprogrammed to transmit a digital binary bit time sequence code of a selected number of bits each occupying approximately 12 milliseconds of time. A receiver decodes the transmitted bit code within a fifth of a second to cause actuation... | 12/01/1981 |
| 4303088 | Pneumatic valve and regulator assembly A normally closed pneumatic valve and regulator assembly having regulator and vent valve spools is actuated by an operator pushbutton to automatically regulate pressure of a fluid provided from a pressure source. The valve assembly automatically vents whe... | 12/01/1981 |
| 4302710 | Sun tracking controller An apparatus which controls the electric tracking motors of solar energy collectors and other solar devices which are adapted to be aimed at the sun.... | 11/24/1981 |
| 4302670 | Electrogenic seed treater Method and apparatus for treating seeds, such as corn, soy beans and rice, in which the seeds are first coated with a mixture of water and enzyme and then subjected to a series of electrical potentials that causes water, ion particles, and nitrogen compon... | 11/24/1981 |
