Patent US3570191A successfully refreshed from Google Patents.
US3570191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrostatic spindle
Assignee: TYDEMAN MACHINE WORKS Inc
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Filing: 1969-04-22
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Granted: 1971-03-16
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Expires: 1989-04-22
Abstract
Abstract A CONSTRUCTION FOR A HYDROSTATIC SPINDLE JOURNAL WITH AN INCLUDED THRUST BEARING EMPLOYS A STATIONARY SHAFT HAVING A PLURALITY OF HYDROSTATIC FLUID SUPPORT BEARING PADS MILLED IN ITS OUTER SURFACE WITH EACH BEARING PAD SUPPLIED WITH A SOURCE OF PRESSURIZED FLUID AND A TUBULAR SLEEVE ROTATABLY MOUNTED ON THE SHAFT WHICH CARRIES THE WORKING ELEMENT OF THE SPINDLE. THE SHAFT ALSO INCLUDES AN INTEGRAL THRUST DISC WHICH IS RECEIVED IN A CIRCULAR RECESS IN THE TUBULAR SLEEVE AND PROVIDES, THROUGH SIMILAR BEARING PADS IN ITS RADIAL SURFACES, AN AXIAL HYDROSTATIC THRUST BEARING FOR THE TUBULAR SLEEVE.
Inventors
- 👤 Alan F Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:45
CPC Classifications
B; B24; B24B; B24B41/00; B24B41/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |