US2188172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat transfer system
Assignee: General Electric Co
•
Filing: 1937-01-06
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Granted: 1940-01-23
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Expires: 1957-01-06
Abstract
No abstract record available.
Inventors
- 👤 Frederick H Brehob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:56
CPC Classifications
F; F01; F01P; F01P3/00; F01P3/20; F28; F28F; F28F9/00; F28F9/26; F28F9/262; F01P3/18; F01P2003/185; F01P2060/00; F01P2060/04
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) | 1943-01-22 | 1943-07-24 | 1944-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-01-22 | 1947-07-24 | 1948-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-01-22 | 1951-07-24 | 1952-01-23 | $7700.00 | Window Closed / Lapsed |