Patent US4214877A successfully refreshed from Google Patents.
US4214877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fine grit abrasive
Assignee: Saint Gobain Abrasives Inc
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Filing: 1978-12-19
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Granted: 1980-07-29
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Expires: 1998-12-19
Abstract
Abstract Calendaring of woven polyester fabric at 20 to 60 tons pressure and 200° to 380° F., provides a smooth surface, upon which fine grit abrasive may be applied, to produce flexible coated abrasive articles for polishing applications.
Inventors
- 👤 Raymond E. Pemrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:28
CPC Classifications
B; B24; B24D; B24D11/00; B24D11/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
98 words
A fine grit flexible coated abrasive sheet having a heat calendered cloth backing woven of polyester yarn, said backing, exclusive of coatings, having a weight of 3.5-9.5 oz./sq.yd. a stretch profile in the warp direction of ≦6% at 50 lbs. ≦9% at 100 lbs. and <15% at 200 lbs. tensile strength and having on the side to which the maker coat is applied, a fabric surface which is defined by a surface roughness reduction from uncalendered heatstretched cloth of from 55 to 85%, a thickness reduction of 20 to 35%, and a peel strength adhesion reduction of ≦40%.
Claim 2
Dependent Claim
98 words
A fine grit flexible coated abrasive sheet having a heat calendered cloth backing woven of polyester yarn, said backing, exclusive of coatings, having a weight of 3.5-9.5 oz./sq.yd. a stretch profile in the warp direction of ≦6% at 50 lbs. ≦9% at 100 lbs. and <15% at 200 lbs. tensile strength and having on the side to which the maker coat is applied, a fabric surface which is defined by a surface roughness reduction from uncalendered heatstretched cloth of from 55 to 85%, a thickness reduction of 20 to 35%, and a peel strength adhesion reduction of ≦40%.
Claim 3
Dependent Claim
32 words
A fine grit coat abrasive product according to claim 1, where the surface roughness of the calendered is preferably reduced from 65-75%, the thickness reduced 25-30%, the peel adhesion strength reduced ≦20%.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-29 | 1984-01-28 | 1984-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-29 | 1988-01-28 | 1988-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-29 | 1992-01-28 | 1992-07-29 | $7700.00 | Window Closed / Lapsed |