Patent US4021660A successfully refreshed from Google Patents.
US2345331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat interchange apparatus
Assignee: Morris Motors Ltd
•
Filing: 1943-04-06
•
Granted: 1944-03-28
•
Expires: 1963-04-06
Abstract
No abstract record available.
Inventors
- 👤 Dono George Edward
- 👤 Goddard Ronald Harbridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:34
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/02; F28D; F28D9/00; F28D9/0081
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1947-03-28 | 1947-09-27 | 1948-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-03-28 | 1951-09-27 | 1952-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-03-28 | 1955-09-27 | 1956-03-28 | $7700.00 | Window Closed / Lapsed |