US2875776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for preventing back flow
Assignee: Individual
•
Filing: 1956-05-07
•
Granted: 1959-03-03
•
Expires: 1976-05-07
Abstract
No abstract record available.
Inventors
- 👤 Jr Lee Skipwith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:57
CPC Classifications
B; B05; B05B; B05B7/00; B05B7/02; B05B7/12; B05B7/24; B05B7/2402; B05B7/244; B05B7/2443; E; E03; E03C; E03C1/00; E03C1/02; E03C1/10; E03C1/102; E03C1/104; E03C1/108; F; F16; F16K; F16K15/00; F16K15/14; F16K15/1402; F16K15/144; F16K15/147; F16K15/1471; Y; Y10; Y10T; Y10T137/00; Y10T137/3149; Y10T137/3185; Y10T137/3294; Y10T137/3331; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7843; Y10T137/7854; Y10T137/7857; Y10T137/7879; Y10T137/788; Y10T137/7882; Y10T137/7885
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-02 | 1962-09-01 | 1963-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-02 | 1966-09-01 | 1967-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-02 | 1970-09-01 | 1971-03-03 | $7700.00 | Window Closed / Lapsed |