Patent US1068721A successfully refreshed from Google Patents.
US2241070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat pump system
Assignee: General Electric Co
•
Filing: 1939-07-15
•
Granted: 1941-05-06
•
Expires: 1959-07-15
Abstract
No abstract record available.
Inventors
- 👤 David W Mclenegan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:19
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/001; F25; F25B; F25B13/00; F25B2313/00; F25B2313/027; F25B2313/02791
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) | 1944-05-05 | 1944-11-04 | 1945-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-05-05 | 1948-11-04 | 1949-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-05-05 | 1952-11-04 | 1953-05-06 | $7700.00 | Window Closed / Lapsed |