Did You Know...
...that when IBM conducted a market study of Chester Carlson's invention in 1959, the company concluded that it would take only 5000 units of his new product to saturate the market? IBM therefore declined to be part of the new product introduction. Too bad for IBM. Carlson's invention was the xerography process, and his new product was the beginning of the Xerox Corporation. It is estimated that every day, worldwide, 3,000,000,000 copies are made!!
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| Number | Title | Issue Date |
| 4988076 | Valves having a turnable closure member such as a butterfly valve A butterfly valve seat structure has a polymeric sealing head slidably supported on the radially inner portion of a flat metal washer so as to be capable of radial sliding movement on the washer, a radially outer portion of the washer being rigidly clampe... | 01/29/1991 |
| 4898363 | Butterfly and ball valves In a fire-safe butterfly valve a polymeric seat ring is resiliently biassed by a resilient metal energizer ring to hold the polymeric seat ring engaged with the closed valve disc, and an independent metal sealing ring permanently engages with the closed v... | 02/06/1990 |
| 4560142 | Butterfly and ball valves In order to provide an unobstructed outer face on a retaining ring for the seal assembly of a butterfly valve, so that the outer face can make an improved seal with an adjacent pipe end, the retaining ring is held captive in the valve housing by a wire ri... | 12/24/1985 |
| 4491298 | Butterfly valve A fire-safe butterfly valve (FIG. 2) provides bi-directional sealing. In normal duties a polymeric seal provides forward and reverse sealing against the edge of the valve disc, the polymeric seal being resiliently loaded in the axial direction of the valv... | 01/01/1985 |
| 4271858 | Butterfly valve having temperature responsive sealing means In a butterfly valve, comprising a valve disk which is pivotally mounted in a valve housing for movement between a closed position, in which it prevents the flow of fluid along a passageway defined by the housing, and an open position in which the flow of... | 06/09/1981 |
| 4244387 | Rotary valve with temperature responsive seal means In a butterfly valve, comprising a valve disk pivotally mounted for movement between a closed position, in which the disk prevents the passage of fluid along a passageway, and an open position, in which the passage of fluid is allowed, an annular seal is ... | 01/13/1981 |
