Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 4375892 | Oil well drilling rig mover An oil well drilling rig mover is formed from a pair of laterally spaced dollies detachably connected by braces between them. Each of the dollies includes a beam for resting on a support, and a pair of laterally spaced wheels at each end of the beam. An a... | 03/08/1983 |
| 4375768 | Electronic circuit for processing the measured values from a vortex sequence produced by a Karman vortex path An electronic circuit for processing measured values obtained from a vortex sequence produced by a Karman vortex path, wherein the ultrasonically sensed signals are processed both digitally in a first circuit branch for a computer and analogously in a sec... | 03/08/1983 |
| 4361743 | Lost motion keyswitch A hollow plunger is slidable vertically in a housing that has an open upper end, but its upward travel is limited to a predetermined elevated position, in which the lower end of the plunger body is spaced above the housing's bottom wall that holds a pair ... | 11/30/1982 |
| 4343564 | Rotatable member rigidly mounted on an undersize shaft A rotatable member is provided with an axial bore that receives one end of an undersized shaft. To fill the space between the shaft and the wall of the bore and to center the shaft in the bore, the portion of the shaft that is in the bore is encircled by ... | 08/10/1982 |
| 4342892 | Keyswitch A keyswitch includes a tubular plunger with a body slidable vertically in an open-top housing that has a bottom wall supporting the lower end of a coil spring extending up around a pair of opposed upright spring contact strips, the lower ends of which ext... | 08/03/1982 |
| 4342212 | Indirect extrusion press A die stem and a billet-receiving sleeve extend rearwardly from an extrusion apparatus platen slide that is movable laterally from a first position in which the stem is aligned with a billet container passage behind it to a second position in which the sl... | 08/03/1982 |
| 4341935 | Slide switch A slide is movable by an actuating knob back and forth in a rectangular housing and is attached to a movable metal contact below it by elements integral with the slide. The contact is pressed downwardly by a spring mounted in a bore in the slide. The hous... | 07/27/1982 |
| 4331186 | Safety push rod assemblies A safety push rod assembly includes a vertical sleeve adapted to extend through the marginal portion of the bonnet of a rotary container filling machine, in which the sleeve is rigidly mounted. Slidably mounted in the sleeve and extending above it is a tu... | 05/25/1982 |
| 4324957 | Slide switch An actuating member in an electric switch housing is provided with a bore that opens downwardly inside the housing and contains a plunger slidably mounted therein and projecting from the lower end of the bore. A coil spring in the bore presses the plunger... | 04/13/1982 |
| 4324077 | Method of moving a drilling rig long and short distances A line of detachably connected skid frames is laid down at a first drilling position for supporting an oil well drilling rig having a base seated on the frames with some of them extending away from opposite ends of the base. After the well has been comple... | 04/13/1982 |
| 4323890 | Switching circuit for monitoring the switching state of switch elements A switching circuit for monitoring the switching state of switching elements wherein the switching state of the switching element is detected and a corresponding signal is generated and this signal is compared to the input signal initially provided for sw... | 04/06/1982 |
| 4323804 | Permanent magnet field motor with radio frequency interference suppressing capacitor The permanent magnet fields encircling the armature of a direct current motor are encircled by a pair of radially spaced cylindrical metal members separated by a cylindrical dielectric member. One of the metal members and one of the brushes that engages t... | 04/06/1982 |
| 4321977 | Hauling vehicle A hauling vehicle in the form of a so-called terminal tractor intended for transporting containers, but which also can be used for transporting different kinds of trailers provided only with rear wheels, is two-axled and provided at its rear end with conn... | 03/30/1982 |
| 4321776 | Shear wall anchoring A shear wall of a building is tied down to an underlying concrete slab by a single tie rod at each end of the wall. The upper end of each rod is secured to a bracket attached to a shear wall stud, and the lower end of the rod extends through a slot in the... | 03/30/1982 |
| 4313466 | Valve for drinking fountains A tap, particularly for drinking fountains, has a plunger 17, operated by a toggle 24 and carrying a compressible valve member 19. The valve member 19 cooperates with a seat 16. In order to simplify replacement of the compressible valve member 19, the sea... | 02/02/1982 |
| 4301587 | Machine for closing standing seams of sheet metal roofing Suspended from a carriage that straddles a standing seam, in which the upper portions of adjoining upright flanges are interlocked, is a vise having a pair of normally spaced jaws with a short length of the standing seam between them. One of the jaws is r... | 11/24/1981 |
| 4298023 | Spring loaded exhalation valve An exhalation valve for inhalation therapy includes a base member provided with an exhalation port encircled by a valve seat for a valve closure disc, the center of which is connected to the inner end of a pin extending outwardly away from the disc and sl... | 11/03/1981 |
| 4294438 | Replaceable liner for a crucible A replaceable liner for a crucible for molten metal consists of an open-top receptacle having at least its side wall made of graphite foil formed earlier by compressing expanded graphite.... | 10/13/1981 |
| 4287144 | Method of manufacturing cementitious articles and various forms of equipment of putting this method into practice This invention concerns a method of manufacturing cementitious articles such as parpens, in which the articles are moulded, preferably by compression, on a base plate serving for handling the articles for the drying operations, especially steam drying.... | 09/01/1981 |
| 4286649 | Apparatus for storing a continuous casting starting bar in elevated position A starting bar for a flow-through continuous casting mold is curved lengthwise in a vertical plane and has a trailing end for joining to a metal strand issuing from the mold, and a leading end portion provided with a row of rack teeth extending along the ... | 09/01/1981 |
| 4274277 | Method of making railway car brake-rod jaw Metal stock is forged into a blank consisting of a rod-like shank joined at one end to the inner ends of a pair of forks having enlarged flattened outer ends projecting laterally of the forks in the same direction and provided with pin-receiving openings.... | 06/23/1981 |
| 4270514 | Fireplace with sliding doors The wall extending laterally away from the side of a fireplace opening is provided with a vertical recess that receives one end of a track extending across the front of the fireplace below the upper surface of its hearth and supporting a glass door normal... | 06/02/1981 |
| 4262171 | Telephone system in which communication between stations is controlled by computers at each individual station A telephone system is provided which requires no central office. All the stations on the system are interconnected by a single line or cable and each station includes a computer which carries out the necessary switching. Each station is then able to call ... | 04/14/1981 |
| 4259098 | Filtering apparatus with sealing means operated from outside the filter chamber The bottom wall of a filter housing is provided with a flow opening and the top of the housing has an access opening normally closed by a cover. A partition wall in the housing is provided with a passage to permit a filter to be moved into and out of the ... | 03/31/1981 |
| 4258835 | Trolley rail section A trolley rail section is formed from a tubular housing that has a front side provided with laterally spaced slots extending lengthwise of the rail, and a partition wall extending across the inside of the housing and closing the inner sides of the slots, ... | 03/31/1981 |
| 4255635 | Keyswitch A keyswitch includes a tubular plunger with a rectangular body slidably mounted in a rectangular housing that has a bottom wall provided in its top with a circular recess receiving the lower end of a coil spring extending up around a pair of upright sprin... | 03/10/1981 |
| 4252114 | Breathing bag assembly A breathing bag inside a rigid case has an inlet and an outlet connected with openings in the case. There is a pressure plate inside the case between one side of it and the bag, the plate being movable toward and away from the opposite side of the case. A... | 02/24/1981 |
| 4251246 | Safety device for side loading filtering apparatus A filter housing has an access opening for passage of a filter sideways into and out of the housing, the opening being surrounded by an outwardly extending flange surrounded by a flange on a removable door. Inside the housing, at the side opposite its out... | 02/17/1981 |
| 4251245 | Side loading filter apparatus A filter chamber provided with a side wall having a row of uniformly spaced openings therethrough also has an end wall provided with an access door from which a track extends along the side wall below the openings. Filter units are insertable through the ... | 02/17/1981 |
| 4249996 | Electrically heated by-product coke oven The coking chamber of a by-product coke oven is formed by a refractory enclosure provided in its top with a charging opening and with an outlet for volatile by-products produced in the coking operation. Forming the bottom of the chamber near the bottom wa... | 02/10/1981 |
| 4243136 | Icing prevention system for a conveyor belt A pump for spraying an anti-freezing liquid on a conveyor belt exposed to freezing temperatures is controlled by an electric circuit containing a timer, a relay provided with a normally open switch, and a normally open thermostat that closes to start the ... | 01/06/1981 |
| 4242777 | Marked cable sling Process for marking slings or the like having a malleable metal sleeve crimped to the sling cable loop, characterized in that intaglio marking is effected on a plate, the plate is introduced into one of the sleeve shaping dies and the press is operated to... | 01/06/1981 |
| 4239581 | Apparatus for sealing lap joints of fusible roofing sheets A burner has a flame chamber formed by flat upper and lower walls connected by side walls and a front end wall, with a fuel inlet for connection to a fuel source and with an open rear end. A handle is connected with one side of the burner for inserting it... | 12/16/1980 |
| 4235859 | Graphite molding powder and method of preparation Vermiform graphite is compressed to produce a preform with a density of about 0.03 to 0.8 g/cc, followed by comminuting the preform to produce a graphite molding powder that will have a typical mold fill-ratio between about 7 and 10 to 1 for making molded... | 11/25/1980 |
| 4235089 | Progressive stamping press A continuous metal strip is fed lengthwise along a line of dies intermittently from one end of the line to the other beneath a vertically reciprocating ram carrying a plurality of punches that are slidable vertically in the ram from a projecting operating... | 11/25/1980 |
| 4233971 | Respirator A ring-shape connecting member is disposed in an opening in the bottom of a breathing bag, where it is encircled and tightly engaged by an elastic sleeve secured to the bag around its opening and projecting downwardly out of the bag. A chemical cartridge ... | 11/18/1980 |
| 4231361 | Breathing apparatus flow device A breathing apparatus flow device has a hollow housing with a bottom opening to receive the upper end of a chemical canister neck, a side opening for connection to a breathing bag, and a top opening for connection to an exhalation tube. Slidably mounted i... | 11/04/1980 |
| 4231360 | Nose clip for respirators A pair of nose pads are connected to the ends of a spring clip that presses the pads against the sides of the nose of the wearer. The connection between the spring and pads is such that the pads can tilt freely relative to the spring clip to avoid discomf... | 11/04/1980 |
| 4228561 | Shock pivot hinge A shock pivot hinge for the upper corner of a door at its hinge side includes an upper jamb leaf and a door leaf below it having an inner side for engaging the face of the door and also having an end portion provided with a vertical opening. The jamb leaf... | 10/21/1980 |
| 4227061 | Method and apparatus for cladding a metal rod with another metal A metal rod is supplied to a pair of bonding rolls provided with peripheral grooves forming a substantially circular roll pass that also receives at opposite sides of the rod a pair of metal strips of a different metal than that of the rod. The rolls pres... | 10/07/1980 |
