US3238883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic drive gear pump
Assignee: MICRO PUMP CORP
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Filing: 1964-03-09
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Granted: 1966-03-08
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Expires: 1984-03-09
Abstract
No abstract record available.
Inventors
- 👤 Thomas B Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:13
CPC Classifications
F; F04; F04C; F04C15/00; F04C15/0057; F04C15/0061; F04C15/0069; F04C11/00; F04C2/00; F04C2/08; F04C2/082; F04C2/086; F05; F05C; F05C2225/00; F05C2225/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
130 words
A PUMP COMPRISING A CASING FORMED AT ONE END WITH A PUMP CAVITY, A PAIR OF SHAFTS IN SAID CASING, PUMP GEARS IN SAID CAVITY MOUNTED ON SAID SHAFTS, SAID CASING FORMED WITH INLET AND OUTLET PORTS COMMUNICATING WITH SAID CAVITY ON OPPOSITE SIDES OF SAID GEARS, A CAP ON SAID ONE END OF SAID CASING CLOSING OFF SAID CAVITY AND DRIVE MEANS FOR ROTATING ONE OF SAID SHAFTS BIASING SAID SHAFT TOWARD SAID CAP WHEREBY SAID GEARS ARE BIASED TOWARD SAID CAP, SAID DRIVE MEANS COMPRISING A FIRST ANNULAR MAGNET ON SAID ONE SHAFT, A SECOND ANNULAR MAGNET SURROUNDING AND IN PROXIMITY TO SAID FIRST MAGNET, AND MEANS FOR ROTATING SAID SECOND MAGNET, EACH SAID MAGNET HAVING A PLANE OF MAGNETIC SYMMETRY, SAID PLANES OFFSET IN AN AXIAL DIRECTION.
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) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |