US2691347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helical gear pump with backed-up nonrigid casing
Assignee: Robbins and Myers Inc
•
Filing: 1950-10-19
•
Granted: 1954-10-12
•
Expires: 1970-10-19
Abstract
No abstract record available.
Inventors
- 👤 Jr George H Zimmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:58
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/10; F04C2/107; F04C2/1071; F04C2/1076
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2463341A
Cited
US2545626A
Cited
US2512765A
Cited
US2532145A
Cited
US2603162A
Cited
US2603161A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-11 | 1958-04-12 | 1958-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-11 | 1962-04-12 | 1962-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-11 | 1966-04-12 | 1966-10-12 | $7700.00 | Window Closed / Lapsed |