Patent US1791441A successfully refreshed from Google Patents.
US1791441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigerating system
Assignee: Individual
•
Filing: 1928-12-07
•
Granted: 1931-02-03
•
Expires: 1948-12-07
Abstract
No abstract record available.
Inventors
- 👤 John C Bertsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:18
CPC Classifications
F; F25; F25B; F25B15/00; F25B15/10; Y; Y02; Y02A; Y02A30/00; Y02A30/27; Y02B; Y02B30/00; Y02B30/62
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) | 1934-02-02 | 1934-08-04 | 1935-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-02-02 | 1938-08-04 | 1939-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-02-02 | 1942-08-04 | 1943-02-03 | $7700.00 | Window Closed / Lapsed |