Patent US2859767A successfully refreshed from Google Patents.
US2859767A
Expired / Lapsed
US
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Valve seat and housing
Assignee: Knapp Mills Inc
•
Filing: 1953-04-13
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Granted: 1958-11-11
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Expires: 1973-04-13
Abstract
No abstract record available.
Inventors
- 👤 Tschudi Traugott
- 👤 Alfred P Knapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:23
CPC Classifications
F; F16; F16K; F16K27/00; F16K27/02; F16K1/00; F16K1/32; F16K1/34; F16K1/36; F16K1/38; F16K1/42; Y; Y10; Y10T; Y10T137/00; Y10T137/598; Y10T137/6031; Y10T137/6058; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49298; Y10T29/49306
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US551011A
Cited
GB189504895A
Cited
US712929A
Cited
US1257011A
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US1570681A
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US1768562A
Cited
US1805158A
Cited
US2606718A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-10 | 1962-05-12 | 1962-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-10 | 1966-05-12 | 1966-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-10 | 1970-05-12 | 1970-11-11 | $7700.00 | Window Closed / Lapsed |