Patent US3704392A successfully refreshed from Google Patents.
Patent US2606032A successfully refreshed from Google Patents.
US2606032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Check valve assembly
Assignee: CHARLES F WARREN JR
•
Filing: 1947-06-06
•
Granted: 1952-08-05
•
Expires: 1967-06-06
Abstract
No abstract record available.
Inventors
- 👤 Warren Kathleen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:42
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/14; F16K15/144; F16K15/145; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US644428A
Cited
US1029726A
Cited
US1935376A
Cited
US2033354A
Cited
US2242582A
Cited
US2211212A
Cited
US2270737A
Cited
US2395906A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-08-05 | 1956-02-04 | 1956-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-05 | 1960-02-04 | 1960-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-05 | 1964-02-04 | 1964-08-05 | $7700.00 | Window Closed / Lapsed |