US2204614A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a heat exchanger
Assignee: Hoover Co
•
Filing: 1938-05-16
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Granted: 1940-06-18
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Expires: 1958-05-16
Abstract
No abstract record available.
Inventors
- 👤 Rudolph S Nelson
- 👤 Arnold D Siedle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:37
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/24; F28F1/32; B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/22; B21C37/24; F28D; F28D7/00; F28D7/08; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378
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) | 1943-06-18 | 1943-12-18 | 1944-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-06-18 | 1947-12-18 | 1948-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-06-18 | 1951-12-18 | 1952-06-18 | $7700.00 | Window Closed / Lapsed |