US2800084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal sand pump
Assignee: Individual
•
Filing: 1955-01-10
•
Granted: 1957-07-23
•
Expires: 1975-01-10
Abstract
No abstract record available.
Inventors
- 👤 Clyde A Butler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:18
CPC Classifications
F; F04; F04D; F04D7/00; F04D7/02; F04D7/04; F04D15/00; F04D15/02; F04D15/0245; F04D15/0272; F04D15/0281
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1591939A
Cited
US1665651A
Cited
US1958108A
Cited
GB372059A
Cited
US2382839A
Cited
US2690131A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-22 | 1961-01-21 | 1961-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-22 | 1965-01-21 | 1965-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-22 | 1969-01-21 | 1969-07-23 | $7700.00 | Window Closed / Lapsed |