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 |
| 4429739 | Heat exchanger The tubes in a U-tube bundle are supported by rod baffles characterized by inner and outer arcuate rod support members. Methods and apparatus for assembling the components of the heat exchanger are also provided.... | 02/07/1984 |
| 4429740 | Combination gas producing and waste-water disposal well The present invention is directed to a waste-water disposal system for use in a gas recovery well penetrating a subterranean water-containing and methane gas-bearing coal formation. A cased bore hole penetrates the coal formation and extends downwardly th... | 02/07/1984 |
| 4429741 | Self powered downhole tool anchor A self powered downhole tool anchor device (10) preattached to a downhole tool (T) and unitarily supported by a drill string (DS) for a single trip into a well bore, actuated by forceful engagement with the bottom or plug (P) in the well bore and attachme... | 02/07/1984 |
| 4429742 | Tubular alignment assembly Hollow tubular members used as piling to support offshore platforms and the like are more easily aligned with a stabbing means. The base of the stabbing means is flexibly attached to the inner surface of one end of a tubular member; the tip of the stabbin... | 02/07/1984 |
| 4429743 | Well servicing system employing sonic energy transmitted down the pipe string A well servicing system in which sonic energy is transmitted down a pipe string to a down hole work area a substantial distance below the surface. The sonic energy is generated by an orbiting mass oscillator and coupled therefrom to a central stem to whic... | 02/07/1984 |
| 4429744 | Oil recovery method Oil is recovered from an oil-bearing reservoir in a process employing an in-situ combustion process utilizing a combustion-supporting gas containing at least 75% by volume pure oxygen, and preferably substantially pure oxygen, and a sequence in which the ... | 02/07/1984 |
| 4429745 | Oil recovery method Oil is recovered from an oil-bearing reservoir in a process employing an in-situ combustion process utilizing a combustion-supporting gas containing at least 75% by volume pure oxygen, and preferably substantially pure oxygen, and a sequence in which the ... | 02/07/1984 |
| 4429746 | Method and apparatus for disposing of drilling muds and wastes generated during well drilling operations and for plugging and abandoning the well Drilling muds and waste fluids pumped to reserve pits and other on-site locations during drilling operations are recycled to the drilled well after the drilling operation is terminated and after the rig is removed from the site of the driling operations. ... | 02/07/1984 |
| 4429747 | Well tool A ported sliding sleeve valve for use in a well tubing to provide a lateral flow path for transfer of fluids between the tubing and the annulus exterior thereof, the lateral ports of the device being initially closed by a port closure sleeve which is mova... | 02/07/1984 |
| 4429748 | Low pressure responsive APR tester valve An annulus pressure responsive tester valve including a pressure assisted isolation valve which includes a pressure differential metering cartridge to control the rate at which the isolation valve returns to the fluid pressure in the annulus between the w... | 02/07/1984 |
| 4429749 | Farrier's equine hoof-sizer A farrier's equine hoof-sizer characterized by its adaptation to an equine's individual hooves for purposes of sizing in shoeing. The sizer is extensible to a straight line for portability. It is lightweight, durable and of such construction that in the s... | 02/07/1984 |
| 4429750 | Ridge leveler A ridge leveler adapted for use with a plow having a forward row of discs and a rearward row of discs comprising: a ridge blade assembly connected to the forward row of discs and positioned generally near the outermost disc of the forward row of discs for... | 02/07/1984 |
| 4429751 | Control system for pile hammers An automatic, fluid actuated, external control system for a pile hammer or the like is provided that can vary the operating stroke length of a pile hammer and that can be used to operate the pile hammer in either a continuous or single stroke mode. A seri... | 02/07/1984 |
| 4429752 | Pneumatic motor for rock drills and the like A pneumatic motor for rock drills and the like having a reciprocating piston with valves at its opposite ends for valving motive air to the piston head from both ends of the cylinder. Large receivers are provided near the respective valves to accommodate ... | 02/07/1984 |
| 4429753 | Rotary pull down pull up drive for drill pipes A gear drive used in water well drilling or blast hole drilling to remove overburden in open pit coal mining, not only rotates the drill pipe but also pulls down or pulls out the drill pipe as it rotates. A hydraulic motor within a housing operates a firs... | 02/07/1984 |
| 4429754 | Method and apparatus for clearing earth drill cuttings from around drill holes Means are provided in combination with the depending cylindrical skirt of a drill rig for conveying drill cuttings from around the drill stem during a drilling operation so they will not deposit in the usual annular pile around the open mouth of the drill... | 02/07/1984 |
| 4429755 | Drill with polycrystalline diamond drill blanks for soft, medium-hard and hard formations Drill bit for drilling bore holes in earth formations, the bit's cutting face provided with cutter preforms composed of polycrystalline diamonds on a tungsten carbide substrate mounted in sets from the center of the bit's face to its periphery. The first ... | 02/07/1984 |
| 4429756 | Weighing scale A platform scale with a low overall height primarily for use as a bathroom scale. A platform receives the load to be weighed and transfers a force to a lever arrangement that converts strains due to load into an electrical signal which is then converted t... | 02/07/1984 |
| 4429757 | Weighing apparatus including a sectional yoke member A weighing apparatus of the electromagnetic load compensation type is disclosed, including a housing, a load receiver connected for vertical movement relative to the housing, a permanent magnet system connected with the housing for establishing a permanen... | 02/07/1984 |
| 4429758 | Motorized cart A motorized hand cart or truck specifically adapted for use by one man in transporting bulky loads over rough and steep terrain of the type typically found in avocado and citrus groves. The cart is designed to be compact, light weight and easily manuverab... | 02/07/1984 |
| 4429759 | Latch mechanism Disclosed is a latching mechanism comprising (a) a plunger adapted to be mounted on a truck body or similar structure, (b) first means for extending and retracting the plunger, (c) a latch hook pivotally mounted on the truck body or similar structure in p... | 02/07/1984 |
| 4429760 | Rear-wheel suspension device for a tricycle vehicle A rear-wheel suspension device on a tricycle vehicle having front and rear vehicle portions interconnected by a rolling joint having a sleeve bearing. To provide increased stability between a pair of rear wheels of the tricycle vehicle, a casing of the ro... | 02/07/1984 |
| 4429761 | Seat and control lever interlock A seat and hydraulic control lever interlock for lift trucks in which access to a battery compartment is in part enabled by pivoting the operator seat forwardly over the steering wheel, which pivotal movement causes interlocking lever means between the se... | 02/07/1984 |
| 4429762 | Horn loudspeakers of the sectorial diffusion type, and method for making said loudspeakers There is disclosed a method for making horn loudspeakers, of the sectorial diffusion type, characterized by the transformation, in order to operate under predetermined sectorial diffusion conditions, of a horn loudspeaker, predisposed for circular diffusi... | 02/07/1984 |
| 4429763 | Bucket rotation system for aerial tower The present bucket rotation system can be easily and quickly interposed in the conventional mechanical bucket leveling system of an aerial tower and may be operated to immediately move the bucket from the normal vertical position to a horizontal position ... | 02/07/1984 |
| 4429764 | Scaffold system for use in sandblasting The subject invention relates to a scaffold system for use in sandblasting. The scaffold system is intended to prevent particulates generated during the sandblasting operation from entering the atmosphere. This result is achieved by providing a platform h... | 02/07/1984 |
| 4429765 | Collapsible sawhorse A collapsible sawhorse is provided in which the legs are pivotally mounted relative to each other for movement between a conventional load supporting sawhorse position and a collapsed position. The collapsible sawhorse comprises a wide work supporting bea... | 02/07/1984 |
| 4429766 | Ladder consisting of sliding sections A sliding section ladder, comprising sections of varying widths made up of u-shaped modules, comprising a base and upright sections, each module being smaller in width than the one immediately before it, the outer sides of the smaller module backing into ... | 02/07/1984 |
| 4429767 | Pelletized brake lining disc brake A disc brake assembly utilizing pelletized brake lining material in a torque absorbing chamber is disclosed. The chamber is positioned around and over the disc and radially inward on opposite sides of the disc. The chamber has an internal cavity for the s... | 02/07/1984 |
| 4429768 | Brakes A mechanical brake actuator has rotatable and non-rotatable cam components provided with confronting helical grooves between which ball bearings are arranged to form a helical thrust bearing. A push rod, connecting rod or the like acts generally tangentia... | 02/07/1984 |
| 4429769 | Floating caliper type disc brake A floating caliper type disc brake comprising a pair of friction pads, a caliper adapted to be mounted on a stationary member to slide thereon in the direction of the axis of a rotatable disc, each of the friction pads having on opposite ends in the direc... | 02/07/1984 |
| 4429770 | Friction lining carrier member having replaceable friction linings The circular friction lining carrier member having replaceable friction linings comprising radially inner and outer circumferential grooves in the carrier member to guide and hold the linings and a supporting element disposed between adjacent ones of the ... | 02/07/1984 |
| 4429771 | Mechanical air failure brake A brake mechanism (10) operable to maintain an air operable control drive mechanism (12) in position in the event of failure of the air supply is disclosed. A first rack section (22) is attached to a control lever (16) of the control drive mechanism (12) ... | 02/07/1984 |
| 4429772 | Drum brake anchor assembly A drum brake assembly includes a pair of brake shoes (16, 18) which are movable by a hydraulic actuator (14) to a braking position. A parking brake lever assembly (24) is operable to also move the pair of brake shoes to the braking position. An anchor ass... | 02/07/1984 |
| 4429773 | Electromagnetic clutch and brake An electromagnetic clutch for use with a motor having a fixed bracket and a rotatable motor shaft which comprises a flywheel attached to the motor shaft and an output shaft rotatably supported by the bracket. A clutch rotor is attached to the output shaft... | 02/07/1984 |
| 4429774 | Pawl and ratchet mechanism A pawl and ratchet mechanism has a baulking member which may be set in a ratcheting condition, a pawl free condition, and a baulking condition. A thrust member, engageable with the baulking member, is movable in first and second directions in which the ba... | 02/07/1984 |
| 4429775 | Clutch type torque control device for air driver A clutch type torque control device characterized in that balls seated in ball receiving holes made in a main shaft are pressed against squarely planed-off surfaces made at the outer circumferential surface of a cam fitted to a driving shaft which is driv... | 02/07/1984 |
| 4429776 | Friction clutch A friction clutch wherein several changeover levers which are made of sheet metal are interposed between the housing on the one hand and the two pressure plates on the other hand. Each changeover lever has two arms with convex surfaces which can roll alon... | 02/07/1984 |
| 4429777 | Automatic locking and adjustment assembly An automatic locking and adjustment assembly for securing a cable (28, 34) to a lever 16 includes a housing (36, 38). A cage (42) cooperates with the housing (36, 38) to carry gripping means (40) engageable with the cable (28, 34) and the housing (36, 38)... | 02/07/1984 |
| 4429778 | Conditioning time control for vending by selection A conditioning time control and method of operation thereof for controlling the pre-vend conditioning of products in a multi-selection vendor having credit entry circuitry, vend selection switches, each vend selection having a pre-established vend price a... | 02/07/1984 |
