US2446144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ratchet ventilator and automatic sash lock
Assignee: Individual
•
Filing: 1945-03-19
•
Granted: 1948-07-27
•
Expires: 1965-03-19
Abstract
No abstract record available.
Inventors
- 👤 Fred D Story
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:52
CPC Classifications
E; E05; E05D; E05D13/00; E05D13/04; E05D13/06; Y; Y10; Y10T; Y10T292/00; Y10T292/08; Y10T292/096; Y10T292/0969; Y10T292/097; Y10T292/0997; Y10T292/1014; Y10T292/1022; Y10T292/103
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US572408A
Cited
US757464A
Cited
US1023014A
Cited
US976265A
Cited
US1548530A
Cited
US1674221A
Cited
US1689101A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-07-27 | 1952-01-26 | 1952-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-07-27 | 1956-01-26 | 1956-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-07-27 | 1960-01-26 | 1960-07-27 | $7700.00 | Window Closed / Lapsed |