Patent US5107839A successfully refreshed from Google Patents.
US2231885A
Expired / Lapsed
US
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Hatch cover ventilating device
Assignee: Individual
•
Filing: 1938-10-21
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Granted: 1941-02-18
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Expires: 1958-10-21
Abstract
No abstract record available.
Inventors
- 👤 George C Christy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:19
CPC Classifications
E; E05; E05C; E05C17/00; E05C17/02; E05C17/04; E05C17/12; E05C17/18; Y; Y10; Y10T; Y10T292/00; Y10T292/20; Y10T292/202; Y10T292/28; Y10T292/285; Y10T292/288
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) | 1944-02-18 | 1944-08-19 | 1945-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-02-18 | 1948-08-19 | 1949-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-02-18 | 1952-08-19 | 1953-02-18 | $7700.00 | Window Closed / Lapsed |