US2874643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helical gear pump with stator compression
Assignee: Robbins and Myers Inc
•
Filing: 1957-10-15
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Granted: 1959-02-24
•
Expires: 1977-10-15
Abstract
No abstract record available.
Inventors
- 👤 Bourke John David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:03
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/10; F04C2/107; F04C2/1071; F04C2/1073
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2527673A
Cited
US2691346A
Cited
US2739650A
Cited
US2695694A
Cited
US2765114A
Cited
US2796029A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-23 | 1962-08-25 | 1963-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-23 | 1966-08-25 | 1967-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-23 | 1970-08-25 | 1971-02-24 | $7700.00 | Window Closed / Lapsed |