US1945973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum producing equipment
Assignee: Ross Heater & Manufacturing Co Inc
•
Filing: 1933-04-01
•
Granted: 1934-02-06
•
Expires: 1953-04-01
Abstract
No abstract record available.
Inventors
- 👤 Harold M Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:49
CPC Classifications
F; F01; F01B; F01B25/00; F01B2250/00; F01B2250/009; Y; Y10; Y10S; Y10S159/00; Y10S159/16; Y10S165/00; Y10S165/092; Y10S165/101; Y10S165/104; Y10S165/106; Y10S165/107
Claims Analysis
Total Claims: 0
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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) | 1937-02-05 | 1937-08-07 | 1938-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-02-05 | 1941-08-07 | 1942-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-02-05 | 1945-08-07 | 1946-02-06 | $7700.00 | Window Closed / Lapsed |