US2437023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Individual
•
Filing: 1931-10-13
•
Granted: 1948-03-02
•
Expires: 1951-10-13
Abstract
No abstract record available.
Inventors
- 👤 Lewis W Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:15
CPC Classifications
F; F02; F02N; F02N11/00; F02N11/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1739069A
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US1736132A
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US1845528A
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US1902646A
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US1761539A
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US1862006A
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US2311105A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-02 | 1951-09-01 | 1952-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-02 | 1955-09-01 | 1956-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-02 | 1959-09-01 | 1960-03-02 | $7700.00 | Window Closed / Lapsed |