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Patent US1332293A successfully refreshed from Google Patents.
US1332293A
Expired / Lapsed
US
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Air-pump
Assignee: W D COIL
•
Filing: 1919-04-28
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Granted: 1920-03-02
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Expires: 1939-04-28
Abstract
No abstract record available.
Inventors
- 👤 Courtney C Hanger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:57
CPC Classifications
F; F04; F04B; F04B33/00; F04B33/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1923-03-02 | 1923-09-01 | 1924-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1927-03-02 | 1927-09-01 | 1928-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1931-03-02 | 1931-09-01 | 1932-03-02 | $7700.00 | Window Closed / Lapsed |