US2877792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surge or back flow valve
Assignee: Individual
•
Filing: 1956-10-12
•
Granted: 1959-03-17
•
Expires: 1976-10-12
Abstract
No abstract record available.
Inventors
- 👤 Frank W Tybus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:14
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/03; F16K15/035; F16K15/036; F16K15/038; F16K2200/00; F16K2200/40; Y; Y10; Y10S; Y10S137/00; Y10S137/904; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7839; Y10T137/7847; Y10T137/7898
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US407981A
Cited
US1743731A
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US920716A
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US1105556A
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US1306391A
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US1793547A
Cited
US2086236A
Cited
US2163472A
Cited
US2761469A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |