US2825210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange apparatus
Assignee: Individual
•
Filing: 1954-07-19
•
Granted: 1958-03-04
•
Expires: 1974-07-19
Abstract
No abstract record available.
Inventors
- 👤 Clifford H Carr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:21
CPC Classifications
F; F28; F28C; F28C1/00; F28C1/02; F24; F24F; F24F1/00; F24F1/0007; F24F1/0035; F24F1/0038; F24F1/0059; F28C1/14; F28D; F28D5/00; F28D5/02; Y; Y02; Y02B; Y02B30/00; Y02B30/54; Y02B30/70; Y10; Y10S; Y10S261/00; Y10S261/03; Y10S261/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1409520A
Cited
US1825498A
Cited
US2368814A
Cited
US2414135A
Cited
US2627396A
Cited
US2634959A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-03 | 1961-09-02 | 1962-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-03 | 1965-09-02 | 1966-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-03 | 1969-09-02 | 1970-03-04 | $7700.00 | Window Closed / Lapsed |