US1374650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum-pump
Assignee: De Laval Separator Co
•
Filing: 1920-02-03
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Granted: 1921-04-12
•
Expires: 1940-02-03
Abstract
No abstract record available.
Inventors
- 👤 Selden H Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:25
CPC Classifications
F; F04; F04C; F04C27/00; F04C27/02; F04C18/00; F04C18/30; F04C18/34; F04C18/344
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) | 1924-04-11 | 1924-10-11 | 1925-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-04-11 | 1928-10-11 | 1929-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-04-11 | 1932-10-11 | 1933-04-12 | $7700.00 | Window Closed / Lapsed |