US1874803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange mechanism
Assignee: Individual
•
Filing: 1931-01-12
•
Granted: 1932-08-30
•
Expires: 1951-01-12
Abstract
No abstract record available.
Inventors
- 👤 Reed Frank Maynard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:54
CPC Classifications
F; F25; F25B; F25B29/00; F25B29/003; F25B2309/00; F25B2309/06; F25B9/00; F25B9/002; F25B9/008
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) | 1935-08-30 | 1936-02-29 | 1936-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-08-30 | 1940-02-29 | 1940-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-08-30 | 1944-02-29 | 1944-08-30 | $7700.00 | Window Closed / Lapsed |