US2337849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum pump
Assignee: W M WELCH MANUFACTURING Co
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Filing: 1939-03-14
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Granted: 1943-12-28
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Expires: 1959-03-14
Abstract
No abstract record available.
Inventors
- 👤 Dubrovin John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:01
CPC Classifications
F; F04; F04C; F04C27/00; F04C27/02; F04C18/00; F04C18/30; F04C18/34; F04C18/344; F04C18/3441; F04C18/3442
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) | 1946-12-27 | 1947-06-28 | 1947-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-12-27 | 1951-06-28 | 1951-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-12-27 | 1955-06-28 | 1955-12-28 | $7700.00 | Window Closed / Lapsed |