US2912997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow control valve
Assignee: Individual
•
Filing: 1954-06-08
•
Granted: 1959-11-17
•
Expires: 1974-06-08
Abstract
No abstract record available.
Inventors
- 👤 David E Griswold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:12
CPC Classifications
G; G05; G05D; G05D7/00; G05D7/01; G05D7/0193; F; F16; F16K; F16K31/00; F16K31/12; F16K31/36; F16K31/365; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7723; Y10T137/7758; Y10T137/7762; Y10T137/7764; Y10T137/7768
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US597810A
Cited
NL34481C
Cited
GB189916318A
Cited
US784408A
Cited
US1184761A
Cited
US1328277A
Cited
US2377227A
Cited
US2583006A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-16 | 1963-05-18 | 1963-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-16 | 1967-05-18 | 1967-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-16 | 1971-05-18 | 1971-11-17 | $7700.00 | Window Closed / Lapsed |