Patent US3561938A successfully refreshed from Google Patents.
US3561938A
Expired / Lapsed
US
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Abrasive disk
Assignee: Merit Products Inc
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Filing: 1968-02-05
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Granted: 1971-02-09
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Expires: 1988-02-05
Abstract
Abstract THIS DISCLOSURE DESCRIBES AN ABRASIVE DISK AND A METHOD OF MAKING AN ABRASIVE DISK WHICH INCLUDES IMPREGNATING A COMPRESSIBLE POROUS BACKING SHEET MATRIX HAVING A PLURALITY OF SEGMENTS DEFINING VOIDS WITH A BONDING MATERIAL WHICH COATS THE SEGMENTS TO FORM A BACKING SHEET. THE BACKING SHEET IS THEN PLACED NEXT TO A HUB AND THE TWO ARE HEATED AND SQUEEZED TO COMPRESS THE BACKING SHEET AND CAUSE THE BONDING MATERIAL TO FLOW TO BOND THE HUB TO THE BACKING SHEET.
Inventors
- 👤 Aleck Block
- 👤 Keith R Whitcomb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:23
CPC Classifications
B; B24; B24D; B24D9/00; B24D9/08; B24D11/00; B24D11/001; B24D11/005
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |