US1887886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deep well pump
Assignee: T H P DUNCAN
•
Filing: 1931-10-24
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Granted: 1932-11-15
•
Expires: 1951-10-24
Abstract
No abstract record available.
Inventors
- 👤 Robert U Grant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:47
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/10; F04B53/12; F04B53/125; F04B53/127; F04B53/128; F01; F01L; F01L23/00; F04B5/00; F04B5/02; F04B53/126; F04B9/00; F04B9/08; F04B9/12; F04B9/129; F04B9/131; F04B9/133
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1935-11-15 | 1936-05-16 | 1936-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-11-15 | 1940-05-16 | 1940-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-11-15 | 1944-05-16 | 1944-11-15 | $7700.00 | Window Closed / Lapsed |