US1971048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential engine
Assignee: Consolidated Car Heating Co Inc
•
Filing: 1932-09-01
•
Granted: 1934-08-21
•
Expires: 1952-09-01
Abstract
No abstract record available.
Inventors
- 👤 Robert J Parsons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:27
CPC Classifications
F; F01; F01B; F01B17/00; F01B17/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/4927; Y10T29/49272
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) | 1937-08-20 | 1938-02-19 | 1938-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-08-20 | 1942-02-19 | 1942-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-08-20 | 1946-02-19 | 1946-08-21 | $7700.00 | Window Closed / Lapsed |