US2581892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cover hinge
Assignee: Tropic Aire Inc
•
Filing: 1947-06-28
•
Granted: 1952-01-08
•
Expires: 1967-06-28
Abstract
No abstract record available.
Inventors
- 👤 Lester W White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:42
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1101521A
Cited
US1126640A
Cited
US1411464A
Cited
US1470910A
Cited
US2216279A
Cited
US2209693A
Cited
US2328833A
Cited
US2433305A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |