Patent US1667992A successfully refreshed from Google Patents.
US1667992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal pump
Assignee: OLIVER SHERWOOD CO
•
Filing: 1924-08-04
•
Granted: 1928-05-01
•
Expires: 1944-08-04
Abstract
No abstract record available.
Inventors
- 👤 Sherwood Charles Frederic
- 👤 Oliver Edwin Letts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:55
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/08; F04D29/16; F04D29/165; F04D29/167
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1931-05-01 | 1931-10-31 | 1932-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-05-01 | 1935-10-31 | 1936-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-05-01 | 1939-10-31 | 1940-05-01 | $7700.00 | Window Closed / Lapsed |