US2642859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fireplace heating system
Assignee: FRANK A MORTIMER
•
Filing: 1949-05-20
•
Granted: 1953-06-23
•
Expires: 1969-05-20
Abstract
No abstract record available.
Inventors
- 👤 Newman T Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:36
CPC Classifications
F; F24; F24B; F24B1/00; F24B1/18; F24B1/185; F24B1/188; F24B1/1885
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US708563A
Cited
US1287815A
Cited
US1987252A
Cited
US2131763A
Cited
US2331178A
Cited
US2360611A
Cited
CH255342A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |