US1690501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Vickers Ltd
•
Filing: 1928-01-11
•
Granted: 1928-11-06
•
Expires: 1948-01-11
Abstract
No abstract record available.
Inventors
- 👤 Potts Charles Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:37
CPC Classifications
F; F28; F28D; F28D1/00; F28D1/02; F28D1/03; F28D1/0308; F28D1/0325; F28D1/0333; F28F; F28F27/00
Claims Analysis
Total Claims: 0
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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) | 1931-11-06 | 1932-05-07 | 1932-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-11-06 | 1936-05-07 | 1936-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-11-06 | 1940-05-07 | 1940-11-06 | $7700.00 | Window Closed / Lapsed |