Patent US3473690A successfully refreshed from Google Patents.
Patent US1349281A successfully refreshed from Google Patents.
Patent US3079175A successfully refreshed from Google Patents.
Patent US2801828A successfully refreshed from Google Patents.
US2801828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger, especially for airplanes
Assignee: HANLON AND WILSON Co
•
Filing: 1954-11-08
•
Granted: 1957-08-06
•
Expires: 1974-11-08
Abstract
No abstract record available.
Inventors
- 👤 John R Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:24
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/124
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US671768A
Cited
US823591A
Cited
US1758214A
Cited
US1883452A
Cited
US1986405A
Cited
US2004252A
Cited
US2080988A
Cited
US2059992A
Cited
US2240311A
Cited
US2428066A
Cited
US2474431A
Cited
US2600595A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-05 | 1961-02-04 | 1961-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-05 | 1965-02-04 | 1965-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-05 | 1969-02-04 | 1969-08-06 | $7700.00 | Window Closed / Lapsed |