US3047274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable area heat exchanger
Assignee: Individual
•
Filing: 1959-02-18
•
Granted: 1962-07-31
•
Expires: 1979-02-18
Abstract
No abstract record available.
Inventors
- 👤 Warren M Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:05
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/02; F28D7/022; F28D7/10; F28D7/106; F28F; F28F27/00; F28F27/02; F28F9/00; F28F9/02; F28F9/026
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-07-30 | 1966-01-29 | 1966-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-30 | 1970-01-29 | 1970-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-30 | 1974-01-29 | 1974-07-31 | $7700.00 | Window Closed / Lapsed |