Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 4353387 | Drainage device The drainage device includes a drainage chamber (9) which communicates via an inlet pipe (20) with a compressed air tank and is provided with an outlet orifice (16), elements (5,24) for closing the outlet orifice and elements (5,19,1,21) for opening the o... | 10/12/1982 |
| 4330103 | Earthquake protector Earthquake protector for protecting apparatus such as a circuit-breaker. The apparatus to be protected is mounted on a support member (2) which is connected to a plate assembly via jack 4. The plate assembly is supported on a base member (8,9) itself firm... | 05/18/1982 |
| 4300586 | Stabilizer for stabilizing the gas pressure in an air blast circuit breaker A stabilizer (1) includes a first passage (20-23) which connects a compressed gas source (2-3) to the circuit breaker and a second passage (9, 16, 34, 22) which makes the circuit breaker communicate with the atmosphere, these passages being normally close... | 11/17/1981 |
| 4295023 | Gas-blast circuit-breaker A gas-blast circuit-breaker which includes several groups of arc-extinguishing chambers, each group being supported by a support above a base, each support including firstly support pillars fixed at various points of the base and secondly a tubular column... | 10/13/1981 |
| 4286301 | H.V. current cut-out circuit The invention relates to a current cut-out circuit for a high-voltage electric installation, a current source being located on an input side and an earth fault possibly occurring on its output side. The circuit is characterized in that between the input a... | 08/25/1981 |
| 4263490 | Device for switching in closing resistors for high-voltage cut-out switches A reciprocating rod bears a bridge which is movable on the rod with initial movement of the rod in a given direction completing closure of bridge carried moving contacts onto stationary contacts for inserting a resistance in a circuit during closure. Link... | 04/21/1981 |
| 4239180 | Compensated force valve with two seats A valve for the escape of compressed air in order to extinguish the electric arc between the moving contacts of a circuit-breaker. The arrangement includes an intermediate moving structure between the control rod and the compensated force valve with two s... | 12/16/1980 |
| 4148085 | Interconnection circuit-breaker and electric power installation employing same High-voltage interconnection circuit-breaker, having connected in parallel, in the first instance a main chamber, having a cut-out power, comprising a rapid functioning on opening and provided for an opening-closing cycle; in the second instance a very ra... | 04/03/1979 |
| 4133994 | Cell of low-voltage feed and distribution cellular switchboard Cell of low-voltage feed and distribution cellular switchboard, characterized in that it comprises, superimposed one above the other, horizontal metallic casings enclosing switching devices and functional units connected therewith.... | 01/09/1979 |
| 4058848 | Cut-off chamber of a lightning protector Cut-off chamber of a lightning protector, characterized in that on the one hand, it comprises a wall made of a porous ceramic substance, ensuring the discharge and the cooling of the gases at the periphery of the chamber, at the time of the ignition of an... | 11/15/1977 |
| 4042968 | High-voltage electrical installation High-voltage high-power, multiphase electrical installation comprising, for each phase, at least two circuit fields that include, in each circuit field, a circuit breaker arranged between two current transformers, each of them discharging into the same lo... | 08/16/1977 |
| 4041545 | Lightning conductor in a metallic casing The invention relates to a lightning conductor having a gaseous enclosure. The lightning conductor which comprises an enclosure filled with insulating gas and is arranged inside a metallic casing under dielectric fluid pressure containing a high-tension e... | 08/09/1977 |
| 4022236 | Safety device for a compressed gas tank Safety device for a compressed gas tank comprising a membrane influenced by an elastic effort and resting simultaneously on two concentric seats. It is characterized in that the applying of the pressure to the seat having the smallest diameter corresponds... | 05/10/1977 |
| 4020860 | Device for dissipating the accidental over-pressure of a fluid A device for dissipating the accidental over-pressure of a fluid contained in an enclosure provided with a sealing membrane intended to be deformed and broken by the over-pressure comprises a mobile piston applied against the membrane subjected to the act... | 05/03/1977 |
| 4016383 | Sealing device for an assembly of elements of high-voltage cut-out devices Sealing device for an assembly of elements of high-voltage cut-out devices comprising on the one hand, a cut-out chamber containing mobile elements integral with contact rods and on the other hand, an auxiliary chamber supporting the said cut-out chamber ... | 04/05/1977 |
| 3966297 | Device for observing an equipment under tension Device for observing electrical equipment under voltage application, characterized in that it comprises an adjustable periscopic glass which include a lens assembly which conforms to and interfits with the observation ports within the equipment and carrie... | 06/29/1976 |
