US1910486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange apparatus
Assignee: Individual
•
Filing: 1930-02-07
•
Granted: 1933-05-23
•
Expires: 1950-02-07
Abstract
No abstract record available.
Inventors
- 👤 Wagner Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:55
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/16; F28F; F28F1/00; F28F1/02; F28D21/00; F28D21/0001; F28D21/0003; F28D21/0005; F28D21/0008; F28F2240/00; Y; Y10; Y10S; Y10S165/00; Y10S165/454; Y10S165/464; Y10S165/905
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1936-05-22 | 1936-11-21 | 1937-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-05-22 | 1940-11-21 | 1941-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-05-22 | 1944-11-21 | 1945-05-23 | $7700.00 | Window Closed / Lapsed |