US2612845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helical gear pump with nonrigid casing
Assignee: Robbins and Myers Inc
•
Filing: 1950-04-29
•
Granted: 1952-10-07
•
Expires: 1970-04-29
Abstract
No abstract record available.
Inventors
- 👤 Byram Frederick Cameron
- 👤 Jr George H Zimmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:32
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/10; F04C2/107; F04C2/1071; F04C2/1076
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1233599A
Cited
US1892217A
Cited
US2505136A
Cited
US2512764A
Cited
GB622583A
Cited
US2512765A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-07 | 1956-04-07 | 1956-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-07 | 1960-04-07 | 1960-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-07 | 1964-04-07 | 1964-10-07 | $7700.00 | Window Closed / Lapsed |