US2981283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic dump drain valve
Assignee: Individual
•
Filing: 1957-04-08
•
Granted: 1961-04-25
•
Expires: 1977-04-08
Abstract
No abstract record available.
Inventors
- 👤 Elwood H Willetts
- 👤 Carl B Ingram
- 👤 Luke E Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:55
CPC Classifications
A; A01; A01G; A01G25/00; A01G25/16; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7869
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2646059A
Cited
US2732859A
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US2768639A
Cited
US2775979A
Cited
US1872792A
Cited
US2006196A
Cited
US2593103A
Cited
US2615675A
Cited
US2730115A
Cited
US2758609A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |