US3420294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roof mounted automobile heat exchanger
Assignee: Cummins Inc
•
Filing: 1966-12-19
•
Granted: 1969-01-07
•
Expires: 1986-12-19
Abstract
No abstract record available.
Inventors
- 👤 Henry O Kirkpatrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:06
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/02; F28D; F28D7/00; F28D7/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1589412A
Cited
US2162512A
Cited
US2405411A
Cited
US2610484A
Cited
US2856162A
Cited
US2977774A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |