US2520087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vane type pump
Assignee: Ex-Cell-O Corp
•
Filing: 1948-05-29
•
Granted: 1950-08-22
•
Expires: 1968-05-29
Abstract
No abstract record available.
Inventors
- 👤 William F Helmrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:50
CPC Classifications
F; F01; F01C; F01C21/00; F01C21/08; F01C21/0809; F01C21/089
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE568184C
Cited
US1074326A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-21 | 1954-02-20 | 1954-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-21 | 1958-02-20 | 1958-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-21 | 1962-02-20 | 1962-08-22 | $7700.00 | Window Closed / Lapsed |