Patent US3568371A successfully refreshed from Google Patents.
US3568371A
Expired / Lapsed
US
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Lapping and polishing machine
Assignee: Spitfire Tool and Machine Co Inc
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Filing: 1969-03-12
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Granted: 1971-03-09
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Expires: 1989-03-12
Abstract
Abstract A MACHINE FOR LAPPING AND POLISHING WORK PLACED UPON A WORK TABLE DISPOSED BENEATH A SUPERSTRUCTURE ROTATABLE ABOUT A VERTICAL AXIS AT ONE SIDE OF THE MACHINE AND CARRYING A PLURALITY OF LAPPING RINGS AND PRESSURE PLATES WITHIN THE RINGS, THE RINGS AND PRESSURE PLATES BEING ELEVATED VERTICALLY WITH RESPECT TO THE SUPERSTRUCTURE FOR MOVEMENT AS A UNIT THEREWITH FROM POSITION UPON AND OVER THE WORK PLATE TO PROVIDE AN UNOBSTRUCTED AREA WITH RESPECT TO THE WORK PLATE.
Inventors
- 👤 Lawrence Day
- 👤 Joseph Dobrick
- 👤 Arthur Kay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:39
CPC Classifications
B; B24; B24B; B24B37/00; B24B37/04; B24B37/07; B24B37/10; B24B37/102
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |