Patent US1691613A successfully refreshed from Google Patents.
US3751005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powdered metal valve plate assembly
Assignee: Westinghouse Electric Corp
•
Filing: 1971-11-30
•
Granted: 1973-08-07
•
Expires: 1991-11-30
Abstract
Abstract The invention provides a substantially impervious molded sintered iron valve plate arrangement wherein both sides of the valve plate include inwardly relieved surfaces and generally planar outwardly disposed surfaces. The outwardly disposed surfaces are ground flat for properly seating gasketing material thereon. The gasketing material maintains the machined area impervious, while the inwardly disposed surfaces have an outer impervious layer formed by subjecting the valve plate to a steam oxide treatment after its formation from powdered metal.
Inventors
- 👤 R Early
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:06
CPC Classifications
F; F16; F16K; F16K27/00; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7839; Y10T137/784; Y10T29/00; Y10T29/49; Y10T29/49405; Y10T29/49412
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
118 words
A substantially impervious sintered metal valve plate and sealing means assembly for preventing the leakage of high pressure gas through said valve plate; said valve plate having opposing generally planar surfaces which include at least first and second areas, said first areas being distinct from said second areas by defining a generally planar machined surface for facing engagement with said sealing means substantially preventing the passage of gas through said first areas; said second areas being depressed from the plane of said first areas and having a gas-impervious surface layer, said second areas including substantially all of said opposing surface not in facing engagement with said sealing means whereby, the assembled plate and sealing means is substantially gas-impervious.
Claim 2
Dependent Claim
118 words
A substantially impervious sintered metal valve plate and sealing means assembly for preventing the leakage of high pressure gas through said valve plate; said valve plate having opposing generally planar surfaces which include at least first and second areas, said first areas being distinct from said second areas by defining a generally planar machined surface for facing engagement with said sealing means substantially preventing the passage of gas through said first areas; said second areas being depressed from the plane of said first areas and having a gas-impervious surface layer, said second areas including substantially all of said opposing surface not in facing engagement with said sealing means whereby, the assembled plate and sealing means is substantially gas-impervious.
Claim 3
Dependent Claim
27 words
Structure according to claim 1 wherein the first areas on one surface of said plate laterally overlap the second areas on the opposite surface of said plate.
Claim 4
Dependent Claim
18 words
Structure according to claim 2 wherein said gas-impervious surface layer of said second areas is an oxidized layer.
References Cited (Backward Citations)
US3123096A
Cited
US1780121A
Cited
US2402950A
Cited
US2752943A
Cited
US2974682A
Cited
US3200838A
Cited
US3370786A
Cited
US3583672A
Cited
US3683965A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |