Patent US3609918A successfully refreshed from Google Patents.
US3609918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sphere grinding and polishing apparatus
Assignee: Individual
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Filing: 1970-03-09
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Granted: 1971-10-05
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Expires: 1990-03-09
Abstract
Abstract GRINDING, LAPPING, AND SMOOTHING APPARATUS TO PRODUCE A PRECISION SPHERICAL OBJECT. THE APPARATUS GENERALLY COMPRISES A WORK PIECE HOLDING AND GRIT APPLYING STATION AND A PAIR OF GRINDING STATIONS MOUNTED ON A SUPPORTING FRAME. THE WORK PIECE STATION IS CENTRALLY DISPOSED WITHIN THE SUPPORTING FRAME AND INCLUDES A ROTATABLE, SPRING RELIEVED, GRIT APPLICATION PAN WHICH CAN BE ELEVATED WITH RESPECT TO THE FRAME. EACH GRINDING STATION HAS A SPRING RELIEVED GRINDING HEAD ASSEMBLY WHICH IS LATERALLY, LONGITUDINALLY, AND TILTABLY MOVABLE WITH RESPECT TO THE WORK PIECE STATION.
Inventors
- 👤 Harold F Hillman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:08
CPC Classifications
B; B24; B24B; B24B11/00; B24B11/02; B24B11/04; B24B11/10
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) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |