US2697987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gear type pump
Assignee: Individual
•
Filing: 1952-05-16
•
Granted: 1954-12-28
•
Expires: 1972-05-16
Abstract
No abstract record available.
Inventors
- 👤 Barclay Cecil Maddison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:26
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/12; F04C2/14; F04C2/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US164147A
Cited
US1118533A
Cited
US1783209A
Cited
US1982027A
Cited
US2344628A
Cited
US2504230A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-27 | 1958-06-28 | 1958-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-27 | 1962-06-28 | 1962-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-27 | 1966-06-28 | 1966-12-28 | $7700.00 | Window Closed / Lapsed |