US2196186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange element and process of making same
Assignee: Individual
•
Filing: 1936-02-14
•
Granted: 1940-04-09
•
Expires: 1956-02-14
Abstract
No abstract record available.
Inventors
- 👤 Alfred J Berg
- 👤 John O Huse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:37
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/22; B21C37/26; 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) | 1943-04-09 | 1943-10-09 | 1944-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-04-09 | 1947-10-09 | 1948-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-04-09 | 1951-10-09 | 1952-04-09 | $7700.00 | Window Closed / Lapsed |