US2637531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for circulating water
Assignee: Individual
•
Filing: 1949-09-17
•
Granted: 1953-05-05
•
Expires: 1969-09-17
Abstract
No abstract record available.
Inventors
- 👤 Harold B Davidson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:40
CPC Classifications
F; F04; F04D; F04D13/00; F04D13/02; F04D13/06; F04D13/08; F04D13/10; F24; F24T; F24T10/00; F24T10/20; Y; Y02; Y02E; Y02E10/00; Y02E10/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1295243A
Cited
GB160588A
Cited
US2006985A
Cited
US2167878A
Cited
US2165854A
Cited
US2461449A
Cited
US2513373A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-04 | 1956-11-03 | 1957-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-04 | 1960-11-03 | 1961-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-04 | 1964-11-03 | 1965-05-05 | $7700.00 | Window Closed / Lapsed |