US2789013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self closing valve
Assignee: Individual
•
Filing: 1953-09-14
•
Granted: 1957-04-16
•
Expires: 1973-09-14
Abstract
No abstract record available.
Inventors
- 👤 Ralph E Bletcher
- 👤 Irving A Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:05
CPC Classifications
B; B05; B05B; B05B1/00; B05B1/30; B05B1/3006; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7723; Y10T137/7781; Y10T137/7782
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1309230A
Cited
US1044439A
Cited
FR499132A
Cited
US1726885A
Cited
US2152110A
Cited
US2247310A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-15 | 1960-10-15 | 1961-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-15 | 1964-10-15 | 1965-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-15 | 1968-10-15 | 1969-04-16 | $7700.00 | Window Closed / Lapsed |