US2055299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating system
Assignee: General Electric Co
•
Filing: 1933-07-06
•
Granted: 1936-09-22
•
Expires: 1953-07-06
Abstract
No abstract record available.
Inventors
- 👤 Walter O Lum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:38
CPC Classifications
F; F24; F24D; F24D19/00; F24D19/10; F24D19/1006; F24D19/1066; F24H; F24H15/00; F24H15/10; F24H15/174; F24H15/20; F24H15/212; F24H15/223; F24H15/254; F24H15/30; F24H15/335; F24H15/355; F24H15/36
Claims Analysis
Total Claims: 0
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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) | 1939-09-22 | 1940-03-23 | 1940-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-09-22 | 1944-03-23 | 1944-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-09-22 | 1948-03-23 | 1948-09-22 | $7700.00 | Window Closed / Lapsed |