US3770480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making coated gaskets
Assignee: FD FARNAM Inc
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Filing: 1971-08-05
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Granted: 1973-11-06
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Expires: 1991-08-05
Abstract
Abstract A method of manufacturing tailored gaskets and the article produced thereby wherein a suitable gasket material is provided with a coating applied in such a manner that there is little loss of coating material, and manufacturing costs are lowered. Ideally, the gaskets are formed from materials in the sheet, blank or web form using single or multiple die-cutting operations before and after the gasket material in various forms is coated with a fluid-impermeable coating.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:37
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/10; F16J15/104; F02; F02F; F02F7/00; F02F7/006; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/26; Y10T428/263; Y10T428/269; Y10T428/31504; Y10T428/31652; Y10T428/3167
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
41 words
The method in accordance with claim 1 wherein the die-cutting of step (a) includes the formation of pilot holes outside the intended configurational boundary of the finished gasket and said final die-cutting step provides scrap meterial which includes said plot hole.
Claim 2
Dependent Claim
42 words
The method in accordance with claim 1 wherein said web or sheet of step (a) is coated on each side with a polymer to thereby provide a curable material coating on each planar surface thereof as well as the interior die-cut surfaces.
Claim 3
Dependent Claim
60 words
The method in accordance with claim 3 wherein said polymer is a blend of synthetic rubber and resin having a high degree of cohesiveness and adhesiveness and said initial die-cuts include the formation of at least a major portion of the external, peripheral edge of said gaskets, wherein such portion of the peripheral edge is also coated in step (b).
Claim 4
Dependent Claim
41 words
The method in accordance with claim 2 wherein the gasket material is in handleable sheet form and the coated sheet of step (b) is placed on carrying means by means of said pilot holes during the at least partial drying thereof.
Claim 5
Dependent Claim
23 words
The method in accordance with claim 4 wherein said polymer is completely cured by subjecting said coated sheet to a totally curing environment.
Claim 6
Dependent Claim
26 words
The method in accordance with claim 3 wherein the thickness of the coating material applied to the gasket material is betweeN 0.0001 inch and 0.005 inch.
Claim 7
Dependent Claim
45 words
The method in accordance with claim 3 wherein said gasket material is in web form and after coating thereof is subjected to a curing process to at least partially cure said polymer and is rolled upon itself in convolute fashion for a later die-cutting step.
Claim 8
Dependent Claim
17 words
The method in accordance with claim 3 wherein mop coating is used to apply the coating material.
Claim 9
Dependent Claim
27 words
The method in accordance with claim 3 wherein said curable polymer is applied as a water dispersion and is completely cured before the final die-cutting step (d).
Claim 10
Independent Claim
121 words
A method of forming gasket stock from which gaskets may ultimately be cut comprising: a. forming a sheet of gasket material of selected characteristics; b. die-cutting said sheet with a plurality of die-cuts thereby forming at least the required bolt holes and the interiors of the ultimate gaskets, c. coating the thusly die-cut sheet of step (b) at least to cover the configurational inside boundaries of the ultimate gaskets with a curable material capable of imparting fluid resistance and providing conformability of said gasket material, d. at least partially curing the coated sheet of step (c); and e. storing said coated and partially cured sheet until such time as it be desired to die-cut the exterior configuration of said ultimate gaskets.
Claim 11
Dependent Claim
17 words
The method in accordance with claim 3 wherein vacuum impregnation is used to apply the coating material.
Claim 12
Dependent Claim
27 words
The method in accordance with claim 1 wherein the scrap from the die-cutting step (a) is recycled to be used as a source of replacement gasket material.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |