Patent US3619948A successfully refreshed from Google Patents.
US3619948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internally powered rotary abrasive means
Assignee: Merit Holding Inc
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Filing: 1969-04-21
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Granted: 1971-11-16
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Expires: 1989-04-21
Abstract
Abstract A HOLLOW MANDREL POWERED BY AN INTERNAL MOTOR CARRIES RADIAL ABRASIVE LEAVES, THE MANDREL HAVING PERIPHERAL RECESSES AND RIBS FOR AIR COOLING EFFECT, THE RECESSES PROVIDING OVERHANGING SHOULDERS, THE ABRASIVE LEAVES BEING ATTACHED TO SUITABLE RETAINER MEMBERS AND THE RETAINER MEMBERS RELEASABLY ENGAGING THE OVERHANGING SHOULDERS.
Inventors
- 👤 Russell W Burns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:46
CPC Classifications
B; B24; B24D; B24D13/00; B24D13/18; B23; B23C; B23C3/00; B23C3/28; B24D13/02; B24D13/06
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |