US2498715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sliding vane pump
Assignee: TREADWELL ENGINEERING Co
•
Filing: 1945-03-03
•
Granted: 1950-02-28
•
Expires: 1965-03-03
Abstract
No abstract record available.
Inventors
- 👤 Erik G Seastrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:38
CPC Classifications
F; F04; F04C; F04C11/00; F04C2/00; F04C2/02; F04C2/04; F04C2/045; F04C27/00; F04C2/30; F04C2/34; F04C2/344; F04C2/352
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US493844A
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US724132A
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US888344A
Cited
US1088836A
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US1263550A
Cited
GB181866A
Cited
US1535275A
Cited
GB308420A
Cited
CH142250A
Cited
US2339966A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-27 | 1953-08-29 | 1954-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-27 | 1957-08-29 | 1958-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-27 | 1961-08-29 | 1962-02-28 | $7700.00 | Window Closed / Lapsed |