US3157227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat pump
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1961-11-30
•
Granted: 1964-11-17
•
Expires: 1981-11-30
Abstract
No abstract record available.
Inventors
- 👤 Jewell S Palmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:16
CPC Classifications
F; F25; F25B; F25B27/00; F25B13/00; F25B30/00; F25B30/06; Y; Y10; Y10S; Y10S55/00; Y10S55/29
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1737040A
Cited
US2124268A
Cited
US2209787A
Cited
US2263476A
Cited
US2468626A
Cited
US2799482A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-17 | 1968-05-18 | 1968-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-17 | 1972-05-18 | 1972-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-17 | 1976-05-18 | 1976-11-17 | $7700.00 | Window Closed / Lapsed |