Patent US3562964A successfully refreshed from Google Patents.
US3562964A
Expired / Lapsed
US
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Lapping machine
Assignee: Spitfire Tool and Machine Co Inc
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Filing: 1970-02-24
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Granted: 1971-02-16
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Expires: 1990-02-24
Abstract
Abstract A LAPPING MACHINE HAVING A HORIZONTALLY ROTATABLE RELATIVELY FLAT LAPPING PLATE IN FACIAL CONTACT WITH A RELATIVELY FLAT SPIRALLY WOUND TUBULAR COIL ARRANGED THEREBENEATH AND THROUGH WHICH A COOLANT CIRCULATES TO MAINTAIN THROUGHOUT A LAPPING OPERATION A UNIFORM TEMPERATURE OF THE LAPPING PLATE AND A PRESSURE PLATE THEREIN AND OF THE WORK DISPOSED UPON THE LAPPING PLATE BENEATH THE PRESSURE PLATE.
Inventors
- 👤 Lawrence Day
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:07
CPC Classifications
B; B24; B24B; B24B37/00; B24B37/005; B24B37/015
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |