US3033516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gate valve with back pressure means
Assignee: Individual
•
Filing: 1958-06-06
•
Granted: 1962-05-08
•
Expires: 1978-06-06
Abstract
No abstract record available.
Inventors
- 👤 John L Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:12
CPC Classifications
F; F16; F16K; F16K3/00; F16K3/02; F16K3/0281
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US800908A
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US1238259A
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US1278863A
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US1268511A
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US1406060A
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FR596871A
Cited
US1978730A
Cited
US2111560A
Cited
US2842283A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-07 | 1965-11-06 | 1966-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-07 | 1969-11-06 | 1970-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-07 | 1973-11-06 | 1974-05-08 | $7700.00 | Window Closed / Lapsed |