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 21:36
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/02; F04C2/063; F04C2/077
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US322840A
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US1308352A
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US867866A
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US971088A
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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 |