US2862454A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helical gear pumps
Assignee: Robbins and Myers Inc
•
Filing: 1955-06-24
•
Granted: 1958-12-02
•
Expires: 1975-06-24
Abstract
No abstract record available.
Inventors
- 👤 Alcock Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:33
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)
BE519756A
Cited
US2409688A
Cited
US2545626A
Cited
US2603162A
Cited
US2603161A
Cited
US2612845A
Cited
US2765114A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-01 | 1962-06-02 | 1962-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-01 | 1966-06-02 | 1966-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-01 | 1970-06-02 | 1970-12-02 | $7700.00 | Window Closed / Lapsed |