Patent US1675239A successfully refreshed from Google Patents.
Patent US2453271A successfully refreshed from Google Patents.
US2453271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary alternating pistons pump
Assignee: Individual
•
Filing: 1943-02-15
•
Granted: 1948-11-09
•
Expires: 1963-02-15
Abstract
No abstract record available.
Inventors
- 👤 Sales Frederick James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:40
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/02; F04C2/063; F04C2/077
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US322840A
Cited
US1308352A
Cited
US867866A
Cited
US971088A
Cited
GB128013A
Cited
US1921747A
Cited
US1819689A
Cited
US1941651A
Cited
GB466199A
Cited
US2132596A
Cited
GB520694A
Cited
GB548857A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-09 | 1952-05-10 | 1952-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-09 | 1956-05-10 | 1956-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-09 | 1960-05-10 | 1960-11-09 | $7700.00 | Window Closed / Lapsed |