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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 4187058 | Portable air compressor A portable air compressor which operates from a cigarette lighter socket is housed in a generally triangular casing having a luminescent triangular hazard warning on at least one surface. The casing includes a lower compartment in which the compressor and... | 02/05/1980 |
| 4186935 | Three-wheeled vehicle A three-wheeled vehicle is disclosed having an improved simplified, light weight, tubular frame design which provides a U-shaped anti-sway bar for resistance to twisting of the frame and allows a steering system having a pair of front wheels to be steered... | 02/05/1980 |
| 4187496 | Keyless vehicle intrusion alarm A keyless vehicle intrusion alarm is armed by momentary depression of the brake pedal or actuation of some other electrically-responsive circuit, followed by the opening and closing of a particular vehicle door within a first predetermined time period. In... | 02/05/1980 |
| 4185777 | Fluidic spray device of simple construction A spray device comprises a fluidic element formed as recesses in a first surface of one member and sealed by abutting a second surface of another member against the first surface and pressing the two members together in a forced-fit arrangement. In order ... | 01/29/1980 |
| 4182254 | Tanks for the storage and transport of fluid media under pressure A tank for the transport or storage of liquified natural gas under pressure is of generally rectangular form and has its side, top and bottom walls each composed of a series of parallel lobes of part-spherical cross-section and of say, 3.0 to 4.0 meters c... | 01/08/1980 |
| 4179019 | Apparatus for reclaiming used lubricating oils A used lubricating oil reclamation apparatus in which filters, heat exchangers, a vaporizer unit, pumps and other necessary equipment are all contained in a wheeled cabinet. The oil to be reclaimed is pumped through a warming heat exchanger, a first filte... | 12/18/1979 |
| 4178476 | Automatic nationwide paging system In a radio paging system with multiple base stations covering respective geographic areas, subscribers may move freely from area to area and transfer their paging service accordingly by means of a local telephone cell. Radio-transmitted pages are confined... | 12/11/1979 |
| 4176254 | Emergency roadside telephone system An emergency roadside telephone system includes a plurality of self-powered, emergency telephone terminals positioned at remote locations, such as along roadways, to permit communication with a central station in order to obtain emergency assistance. Each... | 11/27/1979 |
| 4175421 | Meter provers A meter prover is provided in which a substantially spherical plug travels through a U-shaped calibration conduit between two delivery/receiving stations at the ends of the conduit, and each said station contains means for selectively retaining the plug i... | 11/27/1979 |
| 4175710 | High performance shredder apparatus The shredder apparatus has all high wear regions of the stationary parts protected by readily replaceable liners. A funnel fed arrangement into the shredder chamber prevents jams of material being fed to machine and build up of foil and dirt, etc., which ... | 11/27/1979 |
| 4173936 | Tanks for the storage and transport of fluid media under pressure A support system is provided for a tank for the storage of fluid media under pressure which tank has its top, bottom and side walls each made up of a series of parallel outwardly convex lobes. The bottom supports of the support system comprise A-frame cra... | 11/13/1979 |
| 4173323 | Aircraft launching techniques An aircraft take-off runway, especially a ship's flight desk, is provided with a terminal ramp that curves upward to launch the aircraft in a semi-ballistic trajectory. The ramp is so configured as to have a varying contour or profile, in longitudinal sec... | 11/06/1979 |
| 4173376 | Bearing assemblies A bearing assembly is provided in which bearing preload is exerted by both high and low rate non-linear springs, the low rate springs being substantially collapsed when the preload is applied. A shaft is mounted in two angular contact ball bearings contai... | 11/06/1979 |
| 4171065 | Circuitry and system for controlling multi-use article dispensing cells A circuit and system is presented for controlling operation of a cell or hopper for dispensing controlled quantities of similarly shaped but different small articles. Copending patent application Ser. No. 533,255 filed on Dec. 16, 1974, by Hurst et al., d... | 10/16/1979 |
| 4167789 | Asynchronous circuit and system An asynchronous logic circuit is provided having three stable states, namely two information states and a neutral state. Information is transferred between cascaded such circuits wholly under the control of such circuits and at a rate determined by the de... | 09/11/1979 |
| 4166328 | Shoe repair device The invention provides a device for covering on a tennis shoe the worn area resulting from dragging the rear foot when hitting the ball and moving into the play, the device comprising a side wall having a curve generally conforming to the side and front o... | 09/04/1979 |
| 4157161 | Windshield washer A windshield washer comprises a nozzle in which a liquid jet is formed and repetitively transversely swept before egressing from the nozzle body. The swept jet breaks up into liquid droplets which impinge upon a wide area of a windshield. In a preferred e... | 06/05/1979 |
| 4155108 | Pole-mounted equipment housing assembly Pole-mounted equipment is adaptable for mounting on utility poles having a wide range of diameters and is relatively vandal-proof. A first equipment housing is secured to the pole by plural U-shaped bolts, the ends of which are tightly secured to the firs... | 05/15/1979 |
| 4154071 | Auxiliary locking mechanism The auxiliary locking mechanism of my prior U.S. Pat. No. 3,894,416 is more securely detended and greatly simplified in construction by forming the locking part of the mechanism that is to engage the surrounding metal as a rectangular body and forming a r... | 05/15/1979 |
| 4155104 | Process timer A process timer, particularly suitable for photographic processing, provides a pre-recorded continuous spoken indication of elapsed time, thereby permitting an operator to remain aware of the progress of the process without the requirement for visual moni... | 05/15/1979 |
| 4151955 | Oscillating spray device A fluid dispersal device utilizes the Karman Vortex street phenomenon to cyclically oscillate a fluid stream before issuing the stream in a desired flow pattern. A chamber includes an inlet and outlet with an obstacle or island disposed therebetween to es... | 05/01/1979 |
| 4149628 | Artists paintboxes A combined artists paintbox and a liquid container, comprising a tray for housing the paints and brushes and a sealable liquid container hinged thereto. The liquid container is pivotable from an open position, providing access to the paints in the tray, t... | 04/17/1979 |
| 4149044 | Method and apparatus for graphically displaying amplitude and phase jitter Amplitude and phase jitter can be individually or simultaneously viewed and immediately quantified on an oscilloscope by alternately applying both jitter signals to the vertical (or horizontal) deflection plates at a prescribed chopping frequency and appl... | 04/10/1979 |
| 4149040 | Identifier circuit for identifying party line subscribers An identifier circuit for connection between a telephone system party line and a party line subscriber to permit identification of a calling party line subscriber with automatic number identifying equipment at a central office. The identifier circuit incl... | 04/10/1979 |
| 4139122 | Dispensing pump having no check valves A dispensing pump having no check valves includes upper and lower mechanically-joined pistons which are moveable together through respective upper and lower cylinders. As the pistons are moved in one direction toward a rest position the cylinders are init... | 02/13/1979 |
| 4136978 | High speed electromagnetic printing head A high speed printing head comprises a circular array of stylii drivers for printing characters in a dot matrix format. Each driver includes a permanent magnet and bucking coil electromagnet which when energized causes a stylus to impact a printing surfac... | 01/30/1979 |
| 4136879 | Intern board game A board game portrays the trials, tribulations, and triumphs of an intern and is played on a board simulating a large teaching hospital. There are a plurality of major specialty departments and each player represents the intern from one department. At the... | 01/30/1979 |
| 4132957 | Programmable amplifier The gain of an operational amplifier is switched between +K dB and -K dB by switching circuit positions of the input and feedback impedances. The gain is changed in 0.1 dB steps by changing either the input or feedback impedance by a ratio of 1.0116 for e... | 01/02/1979 |
| 4129631 | Methods for guiding slip-forms in slip-form concreting A method for guiding slip-forms in the casting of concrete structures where use is made of a rigid slip-form which is repeatedly lifted first at that side of the concrete structure being cast from which the slip-form is to be guided away, such that the sl... | 12/12/1978 |
| 4128610 | Method for casting concrete structures The invention relates to a method for casting of concrete structures by means of moulds disposed at two opposite sides of the structure to be cast. The moulds are pressed against the concrete structure by the legs of a yoke construction which is arranged ... | 12/05/1978 |
| 4126407 | Methods of shifting heavy and/or loaded structures Apparatus for sifting heavy supporting structures relative to stationary load carrying structures comprises a plurality of parallel jack rods secured to the load carrying structure. A plurality of climbing jacks adapted to operatively engage the jack rods... | 11/21/1978 |
| 4125637 | Process for embedding hard particles in a bearing surface In a process for forming an extremely hard-wearing rubber or bearing surface on a metal machine part, particles of hard grit, such as carbide grit, are deliberately formed into the surface using a resiliently-loaded tool, so that the surface becomes perma... | 11/14/1978 |
| 4122845 | Personal care spray device A personal care spray device, particularly suitable for use as a facial cleanser and massager, is connected to a faucet and issues a cyclically swept liquid jet against the user's body. A guard wall surrounds the jet outlet opening to prevent splashing an... | 10/31/1978 |
| 4120322 | Hydro-fluidic temperature sensor and control system A hydraulic turbulence amplifier is provided for measuring and controlling the temperature of a liquid supplied to the power nozzle of the amplifier, i.e., the working fluid. As a result of the high pressures at which the laminar-to-turbulence flow transi... | 10/17/1978 |
| 4113204 | Auxiliary control of vehicle direction An auxiliary aerodynamic or hydrodynamic control assembly is provided for a vehicle, such as a guided missile, travelling in a fluid medium, which assembly comprises a number of, say three, control surfaces each carried at the inner end of an arm that is ... | 09/12/1978 |
| 4112257 | Comprehensive automatic mobile radio telephone system In a multi-channel mobile radio telephone system with multiple base stations covering different geographical areas, mobiles may move freely from area to area and automatically originate and receive calls to and from a land-switched telephone network by di... | 09/05/1978 |
| 4111332 | Article counting device A small-article receiving hopper is mounted on the upper surface of an inclined support and is rotated by connection with the drive shaft of a motor projecting through the support. The disk-like bottom of the hopper is undercut to form a circumferential s... | 09/05/1978 |
| 4105203 | Tennis trainer A tennis trainer includes a generally L-shaped arm having a ball holder at one end and pivotally engaged to a support at the other. Impact against the ball in a direction axially along the ball-supporting section of the arm is initially absorbed by a resi... | 08/08/1978 |
| 4102357 | Variable flow outlet valves A variable flow air outlet valve is provided, e.g. for admitting conditioned air to an aircraft cockpit, comprising two relatively rotatable parts relative rotation of which progressively varies the length of the path that the air must follow through the ... | 07/25/1978 |
| 4096741 | Materials testing device The invention provides a d.c. motor and motor control circuit to conduct characterization tests on materials by applying constant loads to or affecting constant displacements of physical samples of various materials for transient tests purposes. The actua... | 06/27/1978 |
