Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 4277568 | Sealant material A sealant for the remedial sealing of self-sealing coke oven doors, or ordinary coke oven doors sealed with a conventional lute, or for sealing spigot joints in off-gas pipe lines in coke oven installations comprises a mixture of from 25 to 45% of a latex... | 07/07/1981 |
| 4275298 | Method of and apparatus for determining the proportion of at least one material in a moving mixture of materials The proportion of a radioactive material in a moving mass of material is determined with a sensor which derives an output signal proportional to the mass of radioactive material. The output signal is calibrated against known reference values to give a qua... | 06/23/1981 |
| 4270326 | Fireproof door for hotels, skyscrapers and the like A fireproof door has a fabric of ceramic or glass fibers attached to a metal frame and covered by facings. The fabric which also may be used as a fireproof mat consists of layers of titanium-treated ceramic or glass fibers felted together by similar needl... | 06/02/1981 |
| 4270288 | Picture frames A picture frame comprising a transparent synthetic plastics plate with inclined edges, and a clamping member which snaps between the inclined edges and presses a picture against the transparent plate by spring action.... | 06/02/1981 |
| 4270901 | Dental articulator A dental articulator which provides a three-dimensional solid cam temporomandibular joint model of a human jaw movement by carving an internal cavity into said three-dimensional solid cam model by a cutting stylis.... | 06/02/1981 |
| 4270667 | Conversion ring for fillers A Conversion ring is provided for externally flanged mouths of tanks having two distinct locking means, one serving to prevent any axial displacement of the ring in relation to the filler mouth and the other for preventing any rotation of the ring once th... | 06/02/1981 |
| 4268462 | Variable venturi carburetor A variable venturi carburetor is disclosed which includes a mixture conduit having therein a throttle plate, a fixed venturi, and a vacuum sustaining plate for variably opening and closing the throat of the fixed venturi. A first fuel nozzle opens into th... | 05/19/1981 |
| 4267700 | Container method and apparatus A cold temperature chilling storage and transportation container specifically is used for fish. The space between double walls of regular or cross-linked polyethylene is filled with polyurethane foam. The outer bottom wall has nine legs formed integrally ... | 05/19/1981 |
| 4264171 | Single-lens mirror reflex camera and release mechanism therefor A release mechanism is provided for the viewfinder mirror, which is held in the viewfinder position, of a single-lens mirror reflex camera having a photoelectrically controlled lens diaphragm. A locking device in the release mechanism, which device interr... | 04/28/1981 |
| 4262593 | Printing apparatus A printing apparatus especially for a cash register has printing wheels mounted on a shaft with a spring pressed friction detent means between the shaft and each wheel so that the wheels are positively driven but can overrun the detent means when they are... | 04/21/1981 |
| 4261220 | Remote control mechanisms The invention comprehends a remote control mechanism having a beam swingable about a pivot to transmit a pushing force to a first cable and a pulling force to a second cable which cables are connected to locations of said beam on opposite sides of said pi... | 04/14/1981 |
| 4262284 | Self-monitoring seal Self-monitoring seals have ends of fiber optic bundle loops mounted in stressed tamper resistant containers. A battery operates microelectronics to change a display in predetermined sequence. Tampering with the container or interrupting or changing the li... | 04/14/1981 |
| 4257191 | Moisture reservoir for fertile soils for plants A granular or plate-like calcium aluminum silicate layer stores water beneath fertile soil. The silicate material may be coated with fertilizer or chemicals and may be shipped and installed within a wrapping, at least one surface of which is moisture perv... | 03/24/1981 |
| 4250693 | Apparatus for packing units of goods under continuous movement Goods to be packed are continuously collected in units of goods. Parallelly therewith plain package blanks are preformed to package containers, which are completely open at least at one vertical side. The units of goods and the open package containers are... | 02/17/1981 |
| 4245751 | Anti-theft filler cap An anti-theft cap for closing a filler pipe of a vehicle fuel tank is provided having a body shaped to locate within the end of the filler pipe and a cover portion having sealing means to engage the end of the filler pipe. A cylinder lock mounted in a bor... | 01/20/1981 |
| 4242784 | Method of manufacturing a spherical bearing A method of manufacturing a spherical bearing having an outer member with an opening therethrough and a concave inner surface on the inner surface of the outer member, an inner member with a convex outer surface complementary to and in precise spherical b... | 01/06/1981 |
| 4241462 | Diaper cover type garment A diaper cover type garment has a first panel with lateral edges which curve from a maximum near a rearward edge to an intermediate minimum corresponding to a between leg portion and which curve outward to a front edge. A second panel slightly and uniform... | 12/30/1980 |
| 4235475 | Mineral mining equipment A mineral mining machine hauls itself along a working face by engaging a round link chain. The links of the chain are fed sequentially from link-retaining pockets in a track component arranged around the working face, around a driven sprocket assembly on ... | 11/25/1980 |
| 4234873 | Alarm installation with a number of self powered indicating elements An alarm system includes a number of self powered indicating elements each with an integral warning device. Each indicating element includes a control circuit which may comprise a transistor switching circuit, transistor oscillator or part of a wheatstone... | 11/18/1980 |
| 4233042 | Air-oil separator A two-stage air-oil separator is connected to the air exhaust system of a compressor. The first stage has a pleated extended area agglomerator formed of layers of glass fiber material. The second stage has radially spaced filter elements with high loft fi... | 11/11/1980 |
| 4218671 | Mine cage position describer A mine cage position describer used for monitoring movement of a member along an elongate path which includes a magnetizable component extensible along the elongate path. The component is magnetized inducing an electrical field to be generated which defin... | 08/19/1980 |
| 4216380 | Field method for detecting deposits containing uranium and thorium Locations of buried deposits containing uranium are determined by detecting the presence of Pb214, Bi214, Po214, Pb210, Bi210 and Po210 in solutions obtained by chemically leaching these elements from rocks and soil. Alpha sensitive nuclear emulsions are ... | 08/05/1980 |
| 4214974 | Process for hydrogenation of coal The invention is an improvement in the process for hydrogenation of a finely divided coal and oil slurry wherein the improvement comprises subjecting the hydrogenation products to a first phase separation to obtain a liquid fraction and a gaseous fraction... | 07/29/1980 |
| 4210193 | Method of producing an aluminum-silicon casting An aluminium-silicon alloy casting in which zones formed so as to have a particularly fine-grained structure are cooled by way of individual thin-walled mould wall portions, which are prevented from dissolving completely by the melt and are intermetallica... | 07/01/1980 |
| 4208220 | Method and apparatus for cleaning heat exchanger tubes mounted transversely to vertical flow of seawater The invention is an apparatus and method for cleaning outsides of heat exchange tubes mounted transversely to the vertical flow of seawater in Ocean Thermal Energy Conversion plants. The invention comprises a number of small floating objects circulating i... | 06/17/1980 |
| 4207894 | Pediatric suction receptacle A pediatric suction receptacle has a closed plastic collector with an upper wall integrally joined to a downward extending wall and an inward sloping wall terminating in a spigot. Two plastic tubes permanently connected to the upper wall have proximal end... | 06/17/1980 |
| 4206806 | Heat-conducting oval pipes in heat exchangers In a heat exchanger, ends of adjacent heat-conducting pipes are flattened to form joining faces and these faces are butt-welded together to form a parallel pipe heat exchanger without end plates.... | 06/10/1980 |
| 4203171 | Shower cabinets A shower cabinet having a flexible curtain support band secured at each end, respectively, to one of a pair of doors so that when the doors are closed part of the band lies between the doors and the remainder is curved and when the doors open the band is ... | 05/20/1980 |
| 4202082 | Method of manufacturing spherical bearings and parts therefor A method of manufacturing a spherical bearing rod end having an outer race member, an intermediate member of yieldable material within and supported by said outer race member and an inner race operationally supported by said intermediate member comprising... | 05/13/1980 |
| 4199827 | Drain traps with strainer means U-shaped drain traps are provided wherein strainer means are disposed within the trap for entrapping various size particles and valuable articles which have accidentally entered the drain. The trap is provided with access means for permitting the strainer... | 04/29/1980 |
| 4199251 | Micro-filming apparatus The micro-filming apparatus comprises an object table, a camera head arranged above said table, a frame pivotally mounted on said table, a glass plate and mounting therefor mounted on said frame, said glass plate being capable of movement perpendicularly ... | 04/22/1980 |
| 4199164 | Nestable roller pallet A nestable load pallet or roller pallet comprising at least two opposed pallet side frames wherein said opposed pallet sides are pivotably connected to a horizontal connection along one of their vertical side edges, and a horizontal pallet deck is pivotab... | 04/22/1980 |
| 4197873 | Fluid operable valves A fluid operable valve suitable for use in high temperature and pressure environments involving the flow of solids material, incorporates a main valve member and a pilot valve member co-operable with separate seats axially spaced apart in association with... | 04/15/1980 |
| 4196935 | Equipment for laying elongate material Equipment for laying a layer of wire mesh adjacent to a newly exposed mine roof comprises storage means (10) for a roll of mesh (11) and resilient guide means (12) for guiding the mesh (72) as it unwinds towards the newly exposed mine roof (5).... | 04/08/1980 |
| 4196503 | Self-aligning bearing with preloading braking member A self-aligning bearing comprising an outer member and an inner member disposed in and supported by the outer member, the outer member having a concave inner surface in bearing contact with the convex outer surface of the inner member, an annular groove p... | 04/08/1980 |
| 4196798 | Brake equipment for mining machines Brake equipment for a mining machine which in use traverses to and fro adjacent to a stationary rail extending along a longwall face and which includes a haulage drive motor for hauling the mining machine along the longwall face, the brake equipment being... | 04/08/1980 |
| 4194655 | Swimmer's wallet A waterproof wallet, which is a highly protective receptacle for driver's licenses, credit cards, and cash, is adapted to be attached to a garment of a surfer. A foldable member houses two hermetically sealable inner pockets. Two openings are formed and s... | 03/25/1980 |
| 4194790 | Rock cutting tip inserts The rock cutting tip insert of a rock cutting tool comprises two layers, the front layer being harder than the backing or base layer by at least one hundred units on the Vickers Hardness scale.... | 03/25/1980 |
| 4193135 | Protective device for the hand This invention relates to a protective device adapted to protect the hand, palm and wrist of a person while one is engaging in a sporting activity, such as skateboarding or football, and can also be used to retain the hand, palm, and wrist substantially i... | 03/18/1980 |
| 4193319 | Push-pull cable core with self-lubricating coating A core is capable of being utilized within a conduit in a push-pull type remote control cable assembly. The core has a metallic wire member and includes a coating around the wire member which has an outer layer of TFE resin. An inner layer of the coating ... | 03/18/1980 |
