US4558542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stick-on abrasive disc
Assignee: Individual
•
Filing: 1980-12-23
•
Granted: 1985-12-17
•
Expires: 2000-12-23
Abstract
Abstract An abrasive or sanding disc for use on a rotary or double action backup pad is provided on its rear surface with a smooth flexible coating to give strength to the sandpaper and to stick to a feathering adhesive on a backup pad. The smooth coating is typically a nylon coating or an adhesive which bonds to the back of the sandpaper and acts as a coating; this coating also adheres strongly to a feathering adhesive on a backup pad. The sanding disc can be strongly secured to the backup pad but can be pulled away from it, leaving the feathering adhesive on the backup pad.
Inventors
- 👤 Miska Marton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:03
CPC Classifications
B; B24; B24D; B24D9/00; B24D9/08; B24D9/085
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
144 words
In combination, a back-up pad for a sanding machine, the back-up pad having a flat surface coated with a feathering adhesive, and an abrasive sheet comprising a paper base sheet, an abrasive bonded to the front surface of the paper sheet and a flexible coating bonded to the rear surface of the paper sheet, the coating providing a smooth rear surface of the abrasive sheet which smooth rear surface is free of adhesive, the combination being such that when the abrasive sheet is secured to the back-up pad the adhesive on the back-up pad, being the sole means for securing the abrasive sheet to the back-up pad, holds the abrasive sheet to the back-up pad for sanding operations, the coating being sufficiently smooth to allow the abrasive sheet to be peeled away from the back-up pad without removing the adhesive from the back-up pad.
Claim 2
Dependent Claim
144 words
In combination, a back-up pad for a sanding machine, the back-up pad having a flat surface coated with a feathering adhesive, and an abrasive sheet comprising a paper base sheet, an abrasive bonded to the front surface of the paper sheet and a flexible coating bonded to the rear surface of the paper sheet, the coating providing a smooth rear surface of the abrasive sheet which smooth rear surface is free of adhesive, the combination being such that when the abrasive sheet is secured to the back-up pad the adhesive on the back-up pad, being the sole means for securing the abrasive sheet to the back-up pad, holds the abrasive sheet to the back-up pad for sanding operations, the coating being sufficiently smooth to allow the abrasive sheet to be peeled away from the back-up pad without removing the adhesive from the back-up pad.
Claim 3
Dependent Claim
25 words
The combination according to claim 1 wherein the flexible coating bonded to the rear surface of the paper base sheet comprises an ethylene-polyvinyl acetate copolymer.
Claim 4
Dependent Claim
24 words
The combination according to claim 1 wherein the flexible coating bonded to the rear surface of the paper base sheet comprises a nylon film.
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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) | 1988-12-16 | 1989-06-17 | 1989-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-16 | 1993-06-17 | 1993-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-16 | 1997-06-17 | 1997-12-17 | $7700.00 | Window Closed / Lapsed |