US2665644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well pump filter
Assignee: Agate Corp
•
Filing: 1952-01-25
•
Granted: 1954-01-12
•
Expires: 1972-01-25
Abstract
No abstract record available.
Inventors
- 👤 Norman C Wells
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:26
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/10; F04B53/1037
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1478427A
Cited
US1554835A
Cited
US1573051A
Cited
US1578720A
Cited
US1628900A
Cited
US2525897A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-11 | 1957-07-13 | 1958-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-11 | 1961-07-13 | 1962-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-11 | 1965-07-13 | 1966-01-12 | $7700.00 | Window Closed / Lapsed |