US2681737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve
Assignee: Dow Chemical Co
•
Filing: 1951-04-07
•
Granted: 1954-06-22
•
Expires: 1971-04-07
Abstract
No abstract record available.
Inventors
- 👤 Louis O Simenson
- 👤 John S Carpenter
- 👤 Arthur B Greenwood
- 👤 Shirley M Greenwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:57
CPC Classifications
B; B65; B65G; B65G65/00; B65G65/30; B65G65/34; B65G65/40; B65G65/46; B65G65/463
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US450689A
Cited
US2537570A
Cited
US2567448A
Cited
US1737090A
Cited
US1713719A
Cited
US2459180A
Cited
US2556653A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-21 | 1957-12-21 | 1958-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-21 | 1961-12-21 | 1962-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-21 | 1965-12-21 | 1966-06-22 | $7700.00 | Window Closed / Lapsed |