US4525177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making coated abrasive disc
Assignee: 90229311 QUEBEC Inc
•
Filing: 1983-03-03
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Granted: 1985-06-25
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Expires: 2003-03-03
Abstract
Abstract The invention is a coated abrasive grinding disk for mounting in the chuck of a drill or the like wherein the grinding pad is of a thermoplastic material having a layer of abrasive material bonded thereto with a layer of thermosetting plastics material.
Inventors
- 👤 Philip M. Grimes
- 👤 John R. Grimes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:41
CPC Classifications
B; B24; B24D; B24D13/00; B24D13/14; B24D18/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
152 words
A method of making a coated abrasive grinding disc with a resilient thermoplastics material back-up pad comprising the steps of: making a back-up pad of a resilient moulded thermoplastics material that has resilience to yield to the contour of a workpiece and strength to transmit grinding force to a workpiece in use; said back-up pad having a work face; supporting the back-up pad on a support disc that resists warping under conditions of heat encountered in plastics curing with the work face of the pad exposed, and applying a holding force to secure the back-up pad on the support disc to resist warping; applying a layer of thermosetting adhesive to the work face of the disc; applying a layer of abrasive grit into the adhesive; drying the adhesive at an elevated temperature; applying a sizing coat of thermosetting adhesive over the abrasive grit; and curing the thermosetting adhesive at an elevated temperature.
Claim 2
Independent Claim
152 words
A method of making a coated abrasive grinding disc with a resilient thermoplastics material back-up pad comprising the steps of: making a back-up pad of a resilient moulded thermoplastics material that has resilience to yield to the contour of a workpiece and strength to transmit grinding force to a workpiece in use; said back-up pad having a work face; supporting the back-up pad on a support disc that resists warping under conditions of heat encountered in plastics curing with the work face of the pad exposed, and applying a holding force to secure the back-up pad on the support disc to resist warping; applying a layer of thermosetting adhesive to the work face of the disc; applying a layer of abrasive grit into the adhesive; drying the adhesive at an elevated temperature; applying a sizing coat of thermosetting adhesive over the abrasive grit; and curing the thermosetting adhesive at an elevated temperature.
Claim 3
Dependent Claim
27 words
A method of making a coated abrasive grinding disc as claimed in claim 1 wherein after curing the disc is emersed in room temperature water for conditioning.
Claim 4
Dependent Claim
42 words
A method of making a coated abrasive grinding disc as claimed in claim 1 wherein the back-up pad is moulded substantially from a polyamide thermoplastic base moulding resin and said abrasive binder consisting substantially of thermosetting resin of a phenolic resin base.
References Cited (Backward Citations)
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US3208837A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-24 | 1988-12-24 | 1989-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-24 | 1992-12-24 | 1993-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-24 | 1996-12-24 | 1997-06-25 | $7700.00 | Window Closed / Lapsed |