Patent US2633338A successfully refreshed from Google Patents.
US2633338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Continental Aviation and Engineering Corp
•
Filing: 1947-02-19
•
Granted: 1953-03-31
•
Expires: 1967-02-19
Abstract
No abstract record available.
Inventors
- 👤 Frederick A Hiersch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:43
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/10; F28D7/106; F02; F02C; F02C7/00; F02C7/08; F28D7/02; F28D7/026; F28F; F28F9/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US826773A
Cited
GB260066A
Cited
GB267086A
Cited
US1857892A
Cited
US1941365A
Cited
US2162956A
Cited
US2227666A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-30 | 1956-09-29 | 1957-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-30 | 1960-09-29 | 1961-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-30 | 1964-09-29 | 1965-03-31 | $7700.00 | Window Closed / Lapsed |