US2054561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Check valve for fire hydrants
Assignee: Individual
•
Filing: 1934-03-24
•
Granted: 1936-09-15
•
Expires: 1954-03-24
Abstract
No abstract record available.
Inventors
- 👤 Stuart N Greenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:49
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/40; F16K17/406; F16K15/00; F16K15/02; F16K15/03; E; E03; E03B; E03B9/00; E03B9/02; E03B9/04; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1632; Y10T137/1654; Y10T137/5327; Y10T137/5403
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1939-09-15 | 1940-03-16 | 1940-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-09-15 | 1944-03-16 | 1944-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-09-15 | 1948-03-16 | 1948-09-15 | $7700.00 | Window Closed / Lapsed |