US2928255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat pump systems
Assignee: Borg Warner Corp
•
Filing: 1957-04-04
•
Granted: 1960-03-15
•
Expires: 1977-04-04
Abstract
No abstract record available.
Inventors
- 👤 James R Harnish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:17
CPC Classifications
F; F25; F25B; F25B13/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2143687A
Cited
US2135285A
Cited
US2351140A
Cited
US2430938A
Cited
US2728197A
Cited
US2744389A
Cited
US2748572A
Cited
US2713249A
Cited
US2801524A
Cited
US2768506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-15 | 1963-09-14 | 1964-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-15 | 1967-09-14 | 1968-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-15 | 1971-09-14 | 1972-03-15 | $7700.00 | Window Closed / Lapsed |