US2437573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heater construction
Assignee: Individual
•
Filing: 1945-10-10
•
Granted: 1948-03-09
•
Expires: 1965-10-10
Abstract
No abstract record available.
Inventors
- 👤 Leo N Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:31
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/04; F24H3/0405
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1316161A
Cited
US1416601A
Cited
US1394667A
Cited
US1754232A
Cited
US1707554A
Cited
US2391111A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-09 | 1951-09-08 | 1952-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-09 | 1955-09-08 | 1956-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-09 | 1959-09-08 | 1960-03-09 | $7700.00 | Window Closed / Lapsed |