Patent US2701331A successfully refreshed from Google Patents.
US2701331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pumping apparatus with electromagnetically propelled piston
Assignee: FRANK K BENNIE
•
Filing: 1949-08-29
•
Granted: 1955-02-01
•
Expires: 1969-08-29
Abstract
No abstract record available.
Inventors
- 👤 John C Holst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:59
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/16; F04B53/162; F04B53/166; F04B17/00; F04B17/03; F04B17/04; F04B17/042; F04B17/044; F04B5/00; F04B5/02; H; H02; H02K; H02K33/00; H02K33/12; H02K33/14; F05; F05C; F05C2201/00; F05C2201/04; F05C2201/0469; F05C2201/0475; F05C2201/0478; F05C2251/00; F05C2251/12; F05C2251/125
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US494956A
Cited
US496331A
Cited
US581204A
Cited
US1647147A
Cited
US1640742A
Cited
US1637425A
Cited
US1804376A
Cited
US1974262A
Cited
US2365632A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-01-31 | 1958-08-02 | 1959-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-31 | 1962-08-02 | 1963-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-31 | 1966-08-02 | 1967-02-01 | $7700.00 | Window Closed / Lapsed |