US2623482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure-relief door for heating units
Assignee: Individual
•
Filing: 1951-01-25
•
Granted: 1952-12-30
•
Expires: 1971-01-25
Abstract
No abstract record available.
Inventors
- 👤 William P Ayers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:11
CPC Classifications
F; F23; F23M; F23M7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US123252A
Cited
US518624A
Cited
US1574711A
Cited
US1783418A
Cited
US2004948A
Cited
US2160262A
Cited
US2193274A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-30 | 1956-06-30 | 1956-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-30 | 1960-06-30 | 1960-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-30 | 1964-06-30 | 1964-12-30 | $7700.00 | Window Closed / Lapsed |