Patent US1781536A successfully refreshed from Google Patents.
US1781536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigeration
Assignee: Servel Inc
•
Filing: 1926-12-22
•
Granted: 1930-11-11
•
Expires: 1946-12-22
Abstract
No abstract record available.
Inventors
- 👤 Brown John Jacob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:50
CPC Classifications
F; F25; F25B; F25B39/00; F25B39/04; F25D; F25D23/00; F25D23/006
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) | 1933-11-10 | 1934-05-12 | 1934-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-11-10 | 1938-05-12 | 1938-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-11-10 | 1942-05-12 | 1942-11-11 | $7700.00 | Window Closed / Lapsed |