US2145684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating means
Assignee: Edwin L Wiegand Co
•
Filing: 1936-02-14
•
Granted: 1939-01-31
•
Expires: 1956-02-14
Abstract
No abstract record available.
Inventors
- 👤 Ernest N Calhoun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:08
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/10; F24C15/102
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1942-01-30 | 1942-08-01 | 1943-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-01-30 | 1946-08-01 | 1947-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-01-30 | 1950-08-01 | 1951-01-31 | $7700.00 | Window Closed / Lapsed |