US2658456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid displacement device
Assignee: Individual
•
Filing: 1948-07-29
•
Granted: 1953-11-10
•
Expires: 1968-07-29
Abstract
No abstract record available.
Inventors
- 👤 Gunnar A Wahlmark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:10
CPC Classifications
F; F01; F01C; F01C21/00; F01C21/18; F01C1/00; F01C1/30; F01C1/34; F01C1/344; F01C1/348; F01C20/00; F01C20/18; F01C20/22; F01C21/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US608401A
Cited
GB190824512A
Cited
US1965388A
Cited
US2049092A
Cited
US2089593A
Cited
US2233551A
Cited
US2380819A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-09 | 1957-05-11 | 1957-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-09 | 1961-05-11 | 1961-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-09 | 1965-05-11 | 1965-11-10 | $7700.00 | Window Closed / Lapsed |