Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 4029170 | Radial sound port speaker A speaker component mounted into a frame and related structure which is designed to reproduce sound in its most real and true form from an amplifier or other sound source and including a speaker mounting panel for the speaker component, a back wall, a fro... | 06/14/1977 |
| 4024493 | Apparatus for motor vehicle position indication Apparatus for tracking motor vehicle position relative to a starting point and for providing continual display of vehicle position. The apparatus includes a gyroscope and odometer for generating respective direction and distance electrical signals which a... | 05/17/1977 |
| 4021870 | Bedding draw sheet An improved bedding draw sheet comprised of a base sheet formed of a textile material, a panel formed of a textile material having water penetration-resistant characteristics bonded to the base sheet and a water-absorbent pad removably attached to the pan... | 05/10/1977 |
| 4020897 | Automatic interior environment control Apparatus for automatic control of environmental conditions in building interiors, particularly in greenhouses where exacting conditions of temperature must be met. The apparatus consists of electronic circuitry for sensing and providing output indication... | 05/03/1977 |
| 4021035 | Knee ball exercise game apparatus A game apparatus for primary use in exercising which consists of an adjustable waist belt having a plurality of circumferentially disposed hooks for receiving adjustable attachment of a tethered cord supporting a light, resilient ball or similar round obj... | 05/03/1977 |
| 4018275 | Anchoring device for well tools An improved anchoring device for well tools including installing and actuating apparatus for providing visual indication at the ground surface verifying proper latching and locking of the device in a casing string. The anchoring device includes a tubular ... | 04/19/1977 |
| 4019139 | Interaction multi-station alarm system A method and apparatus for providing vigilance alarm in or about a multiple station installation as may be used basically in an apartment complex or neighborhood but may be extended to include any number of station alerts wherein an undesired disturbance ... | 04/19/1977 |
| 4005694 | Electronic ignition system An internal combustion engine ignition device of the capacitive discharge type which utilizes a single transistor, semi-conductive controlled rectifier and attendant reactive circuitry to provide timed high voltage application to create a direct current a... | 02/01/1977 |
| 4006483 | Recording chart The present invention relates to a high temperature resistant chart for use in bottom hole pressure recording devices and the like whereby scores representing recordings are inscribed on the chart. The chart is comprised of a flat dark-colored flexible sh... | 02/01/1977 |
| 4004809 | Board game apparatus A board game apparatus comprising a game board with a playing surface divided into four playing areas surrounding a center section, each playing area comprising a plurality of playing spaces separated by open spaces having passage means therethrough and a... | 01/25/1977 |
| 3993377 | Prefabricated cabinet assembly An improved prefabricated cabinet assembly characterized by first and second precut opposite end bulkheads and one or more precut intermediate bulkheads lying in spaced, mutually parallel planes and rigidly connectable to a plurality of precut front panel... | 11/23/1976 |
| 3991887 | Method and apparatus for moving drill pipe and casing A road transportable apparatus for moving drill pipe and casing including a rigid support frame assembly with a bifurcated mast assembly pivotally secured thereto, the support frame assembly being rigidly securable to the walk of a conventional drilling r... | 11/16/1976 |
| 3991470 | Chain saw guard structure A chain saw guard which includes a two-part base structure mountable on the housing and chain guide plate of a chain saw, and a pair of subframes pivotally mounted on the base structure. One subframe includes a pair of lateral frame members positioned on ... | 11/16/1976 |
| 3991537 | Chair rail A chair rail which includes an elongated rigid rail member having a channel centrally positioned on one side thereof and extending over the length of the rail member, a bumper strip of resilient material slidably positioned in the channel and protruding o... | 11/16/1976 |
| 3989487 | Packaged gas stream hydrocarbon dewpoint control apparatus The present invention relates to packaged apparatus for controlling the hydrocarbon dewpoint of a gas stream particularly adapted for use in a cold environment. A weather-tight enclosure is provided which includes a liquid desiccant dehydration unit for d... | 11/02/1976 |
| 3981408 | Apparatus for transporting one vehicle by another A method for transporting one tractor and semi-trailer combination on another tractor and towed semi-trailer which comprises reducing the wheel base of the transported tractor-semi-trailer combination, positioning the transported tractor and semi-trailer ... | 09/21/1976 |
| 3981403 | Oscillating free swinging sifter apparatus A free swinging sifter apparatus which includes a suspension framework, a sieve or sifter housing, suspension members suspending the housing from the framework, selectively positionable weights movably mounted on opposite sides of the housing and means fo... | 09/21/1976 |
| 3979874 | Suspended ceiling system and runner joints therefor A suspended ceiling system employing a plurality of main and cross runners for supporting a plurality of ceiling panels, with both the main and cross runners being provided with means for supporting the ceiling panels. Also disclosed are interlocking join... | 09/14/1976 |
| 3977477 | Combination garden implement apparatus An improved garden implement that is a combination soil working and cartage implement which is comprised of a wheeled, hand powered cultivator with subsoiler capable of receiving a cartage bed for selective use as a wheelbarrow type implement. The impleme... | 08/31/1976 |
| 3977617 | Film winding and perforating apparatus Apparatus for unwinding synthetic resin film from large mill rolls of such film, and concurrently winding the film in a product roll for purposes of marketing, after transversely perforating the film at spaced intervals along its length to form a series o... | 08/31/1976 |
| 3973298 | Tie down brackets for flexible members A tie down bracket for receiving and engaging a bight or loop in a flexible member, such as a rope or cable, such tie down bracket including a base plate having secured thereto a spring mounting body. The spring mounting body includes a projecting finger ... | 08/10/1976 |
| 3966248 | Safety door lock A break-away door lock assembly for use in minimum security areas. The assembly consists of a door lock keeper assembly which includes adjustable pressure pads bearing upon and maintaining a door lock keeper plate in proper coactive position. Thus, the pr... | 06/29/1976 |
| 3965988 | Fire extinguishing method and apparatus A chemical fire extinguishing apparatus which includes a chemical storage chamber, chemical discharge conduct connected to the chamber for conveying and distributing the chemical, and a source of relatively high pressure gas connected to the chamber and c... | 06/29/1976 |
| 3965689 | Venting of cryogenic storage tanks A method and apparatus for venting cryogenic storage tanks. In the method, a non-flammable, non-combustion supporting, relatively warm gas is mixed with cold vapors vented from a cryogenic storage tank to warm the vented vapors to a characteristic density... | 06/29/1976 |
| 3965588 | Ironing boards An ironing board of easily storable and readily accessible character which is particularly adaptable for minimization of utility space within a living area, the ironing board consisting of a board portion adapted for adjustable positioning and support in ... | 06/29/1976 |
| 3966334 | Adhesive applicator device and method An adhesive applicator device including an elongated shaft x-shaped in section formed by the intersection of a pair of webs at a right angle. The webs have tapered end edges, so that the shaft is characterized in having a point at one end thereof where th... | 06/29/1976 |
| 3956997 | Drive-up teller window protection apparatus A drive-up teller window protection apparatus which includes a plurality of downwardly directed nozzles connected to a fluid distribution system supported and housed in a roof structure extending outwardly from a drive-up teller window and positioned a di... | 05/18/1976 |
| 3956126 | Apparatus for disposing of organic waste materials An apparatus for efficiently disposing of combustible organic waste materials, such as organic industrial and household wastes, comprising a macerator and an evaporation unit where liquids are removed from the waste to leave a concentrated organic residue... | 05/11/1976 |
| 3954128 | Sling purse A sling purse, including a flexible, open-topped main bag, having a bottom panel, back and front panels, and two side panels extending between and joining the back and front panels. Flexible, open-topped pockets are secured to the front and back panels, a... | 05/04/1976 |
| 3952747 | Filter and filter insertion instrument A filter for arresting the flow of a liquid entrained, deformable solid or semi-solid body through a tubular vessel or conduit, the filter including a plurality of convergent legs in generally conical array and joined at their convergent ends to an apical... | 04/27/1976 |
| 3951402 | Paper conveyor and guidance system A paper conveyance and guidance system which includes a plurality of paper supporting endless conveyor bands for supporting and conveying a sheet of paper into abutting and properly registering contact with the head stop of a duplicator or printing press,... | 04/20/1976 |
| 3943719 | Hydride-dehydride power system and methods A power system comprising a reactor for chemically forming a hydride by reaction with hydrogen at a relatively low pressure and relatively low temperature, means for heating the hydride while retaining it at a constant volume to effect chemical compressio... | 03/16/1976 |
| 3937584 | Apparatus for securing an elongated handle to the back of a brush or the like Apparatus for securing one end of an elongated handle to the back of a brush or the like including an elongated handle securing member having opposite ends with one end secured to one end of the elongated handle and the opposite end having an oblique end ... | 02/10/1976 |
| 3935713 | Method and apparatus for maintaining and servicing a pressurized refrigeration system or the like A tool for maintaining and servicing a pressurized refrigeration system or the like wherein it is desirable to remove and replace a threaded check valve core without depressurizing the system. The tool includes a body member having a longitudinal passagew... | 02/03/1976 |
| 3934326 | Electric meter installing device An electric meter installing device which includes an annular shield plate having detachably secured thereto, a generally cylindrical housing. A pair of handles project from opposite sides of the housing and are spaced from the shield plate. A suction cup... | 01/27/1976 |
| 3933170 | Apparatus for securing a line tap valve to the exterior of a tubing line An improved apparatus for securing an externally threaded line tap valve to the exterior of a penetrable tubing line such as that found in a closed refrigeration system. The apparatus is adapted to secure a line tap valve to a line having any of a plurali... | 01/20/1976 |
| 3933397 | Bearing and support structure for speed racing roller skate A bearing and support structure for a speed racing roller skate including a support plate, a truck projecting downwardly from the center of the support plate, an axle projecting laterally and horizontally from the truck and extending into a cylindrical be... | 01/20/1976 |
