US2004390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Griscom Russell Co
•
Filing: 1934-04-11
•
Granted: 1935-06-11
•
Expires: 1954-04-11
Abstract
No abstract record available.
Inventors
- 👤 Benzinger Julius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:11
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/02; F28F9/026; F28B; F28B1/00; F28B9/00; F28B9/08; F28F9/0202; F28D; F28D21/00; F28D2021/0019; F28D2021/0068; F28D2021/007
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) | 1938-06-10 | 1938-12-10 | 1939-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-06-10 | 1942-12-10 | 1943-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-06-10 | 1946-12-10 | 1947-06-11 | $7700.00 | Window Closed / Lapsed |