Patent US3665660A successfully refreshed from Google Patents.
US3665660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated abrasive belt joint
Assignee: Saint Gobain Abrasives Inc
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Filing: 1971-01-06
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Granted: 1972-05-30
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Expires: 1991-01-06
Abstract
Abstract A coated abrasive material having a butt joint therein in which the abutted ends of the abrasive material are joined together by an initially thermoplastic, heat-hardened adhesive applied to the backside of the coated abrasive material adjacent the line of abutment and the adhesive layer is reinforced with a woven patch of a particular aromatic polyamide fiber which is placed on the backside so as to cross the abutment line. Adhesive fills the crack between the abutted coated abrasive ends and, moreover, forms a tapered surface from the backside of the coated abrasive material up to the outside surface of the reinforcing patch and preferably coats the exterior surface thereof.
Inventors
- 👤 John F Malloy
- 👤 Nolan A Curry
- 👤 Dirck J Olton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:13
CPC Classifications
B; B24; B24D; B24D11/00; B24D11/06
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
47 words
Coated abrasive material according to claim 1 in which the adhesive is of a character such that upon initial application of heat and pressure it will flow and which upon continued application of heat and pressure will cease to flow and will cure to a flexible-tough-hardened state.
Claim 2
Dependent Claim
29 words
Coated abrasive material according to claim 2 in which the adhesive is the dried, cured product of a composition comprising a blend of nylon polyamide and an epoxy resin.
Claim 3
Dependent Claim
24 words
Coated abrasive material according to claim 3 in which said nylon polyamide is a copolymer of hexamethylene diammonium adipate, hexamethylene diammonium sebacate, and caprolactam.
Claim 4
Dependent Claim
30 words
Coated abrasive material according to claim 4 in which said epoxy resin is a condensation product of epichlorohydrin and bisphenol-A having an epoxide equivalent of from about 185 to 192.
Claim 5
Dependent Claim
29 words
Coated abrasive material according to claim 5 in which the composition blend comprises, based on weight of solids, 75 percent said nylon polyamide and 25 percent said epoxy resin.
Claim 6
Dependent Claim
21 words
Coated abrasive material according to claim 6 in which the reinforcing patch is woven from continuous filament yarns of aromatic polyamide.
Claim 7
Dependent Claim
14 words
Coated abrasive material according to claim 7 in which the aromatic polyamide is poly-m-phenylene-isophthalamide.
Claim 8
Dependent Claim
30 words
Coated abrasive material according to claim 7 in which only the yarns in a direction substantially that of the longitudinal direction of the coated abrasive material are of aromatic polyamide.
Claim 9
Dependent Claim
38 words
Coated abrasive material according to claim 1 in which the reinforcing patch has been pre-impregnated with an adhesive composition which flows on initial application of heat but thereafter on further heat application sets up to a hardened state.
Claim 10
Dependent Claim
167 words
Method for joining together two free ends of coated abrasive material which comprises: a. abutting together two free ends of coated abrasive material having a front side with abrasive grains bonded thereto and a backside free of abrasive grain; b. applying to said backside adjacent each said free end an adhesive composition having the characteristics of being initially flowable on application of heat and on further application curing to a heat-hardened adhesive; c. superimposing on the adhesive layer so as to extend across said abutted ends a woven, porous, reinforcing patch the yarns of which in at least the direction substantially longitudinally of the coated abrasive material being continuous filaments of aromatic polyamide; d. applying heat and pressure to the assembly formed in (c) thereby embedding said patch within the adhesive layer and causing said adhesive to flow between the abutted ends and to form a tapered surface from the outer surface of the patch at each end thereof to the backside of the coated abrasive material.
Claim 11
Dependent Claim
39 words
Method according to claim 11 wherein the patch is pre-impregnated with an initially flowable, heat-hardenable adhesive and this adhesive composition is dried and cured to an essentially non-tacky state before the impregnated patch is superimposed on said adhesive layer.
Claim 12
Dependent Claim
27 words
Method according to claim 12 wherein the chemical formulation of the adhesive composition used to pre-impregnate the patch is the same as that of said adhesive layer.
Claim 13
Dependent Claim
11 words
Method according to claim 13 wherein said aromatic polyamide is poly-m-phenylene-isophthalamide.
Claim 14
Dependent Claim
19 words
Method according to claim 11 wherein said adhesive composition comprises a blend of nylon polyamide And an epoxy resin.
Claim 15
Dependent Claim
31 words
Method according to claim 13 wherein adhesive composition is applied additionally to said non-tacky pre-impregnated patch prior to superimposing it on the adhesive layer on the backside of said free ends.
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |