US3272140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metering pump
Assignee: Monsanto Chemicals Ltd
•
Filing: 1964-04-02
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Granted: 1966-09-13
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Expires: 1984-04-02
Abstract
No abstract record available.
Inventors
- 👤 Philip E Curry
- 👤 Panayotis P Demopoulos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:04
CPC Classifications
F; F04; F04C; F04C15/00; F04C15/0042; F04C15/0049; F04C11/00; F04C11/001; F04C2/00; F04C2/08; F04C2/082; F04C2/084
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
PUMPING APPARATUS FOR PRODUCING A SUBSTANTIALLY CONSTANT FLOW, COMPRISING, IN COMBINATION: (A) A GEAR PUMP HOUSING HAVING AN INLET PORT; (B) FIRST AND SECOND PAIRS OF MESHED GEARS WITHIN SAID HOUSING; (C) SAID SECOND PAIR OF GEARS BEING SO ALIGNED WITH RESPECT TO SAID FIRST PAIR OF GEARS THAT THE TEETH OF THE SECOND PAIR OF GEARS ARE ANGULARLY DISPLACED ONE-
Claim 2
Dependent Claim
61 words
PUMPING APPARATUS FOR PRODUCING A SUBSTANTIALLY CONSTANT FLOW, COMPRISING, IN COMBINATION: (A) A GEAR PUMP HOUSING HAVING AN INLET PORT; (B) FIRST AND SECOND PAIRS OF MESHED GEARS WITHIN SAID HOUSING; (C) SAID SECOND PAIR OF GEARS BEING SO ALIGNED WITH RESPECT TO SAID FIRST PAIR OF GEARS THAT THE TEETH OF THE SECOND PAIR OF GEARS ARE ANGULARLY DISPLACED ONE-
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |