US2059967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange apparatus
Assignee: Individual
•
Filing: 1933-08-05
•
Granted: 1936-11-03
•
Expires: 1953-08-05
Abstract
No abstract record available.
Inventors
- 👤 Charles H Leach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:26
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/02; F28F9/026; F28F9/0265; F28D; F28D7/00; F28D7/0058; F28D7/16; F28D7/163; F28D7/1638; F28F9/007; F28F9/013; F28F9/0132; F28F9/0236; F28F9/0239
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) | 1939-11-03 | 1940-05-04 | 1940-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-11-03 | 1944-05-04 | 1944-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-11-03 | 1948-05-04 | 1948-11-03 | $7700.00 | Window Closed / Lapsed |