US3660184A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing tight seals, and seals obtained by this process
Assignee: Cefilac SA
•
Filing: 1970-05-18
•
Granted: 1972-05-02
•
Expires: 1990-05-18
Abstract
Abstract Method of forming gaskets by projecting a layer comprising 7090% of a fibrous material and 10-30% of a settable binder onto a supporting sheet, causing the binder to set, and there compressing the layer. An adhesive may be used to secure the layer to the sheet, or the sheet may be treated to prevent adhesion of the layer and removed after the compression step.
Inventors
- 👤 Pierre Burelle
- 👤 Jean Alfred Engelhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:35
CPC Classifications
F; F02; F02F; F02F11/00; F02F11/002; F16; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/10; F16J15/102; F16J15/108; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/2907
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
97 words
Method of making gaskets of fibrous material comprising the steps of projecting against at least one face of a support having a substantially plane surface from 70-90 parts of fibers and from 10-30 parts of a heat settable binding agent to form a thick layer of low density on said support, subjecting the support to a compression reducing the thickness of the sheet to not more than one one-hundredth of its original thickness and thereby increasing its density by at least 100 times, and treating the said layer by application of heat to set the binding agent.
Claim 2
Dependent Claim
35 words
Method as claimed in claim 1 comprising the step of treating said surface with an adhesion preventing material before said particulate material is projected thereagainst, and removing said support after said binding agent has set.
Claim 3
Dependent Claim
22 words
Method as claimed in claim 2 in which the thickness of said support is less than one-fourth that of the completed gasket.
Claim 4
Dependent Claim
20 words
Method as claimed in claim 1 comprising the step of applying an adhesive to a flat surface of said support.
Claim 5
Dependent Claim
19 words
Method as claimed in claim 2 in which the support is a perforated sheet less than 0.5 mm thick.
Claim 6
Dependent Claim
16 words
Method as claimed in claim 2 in which said layer is at least 5 cm thick.
Claim 7
Dependent Claim
13 words
Method as claimed in claim 1 in which said support is a cloth.
Claim 8
Dependent Claim
20 words
Method as claimed in claim 2 in which the material projected against said surface comprises 20 parts of elastomeric particles.
Claim 9
Dependent Claim
15 words
Method as claimed in claim 1 in which said material is projected by electro-static flocking.
Claim 10
Dependent Claim
30 words
Method as claimed in claim 1 in which said filler material comprises fibers and said fibers are oriented in different directions in different areas on the surface of said support.
Claim 11
Dependent Claim
25 words
Method as claimed in claim 1 in which the layer formed on said support varies in thickness from one part of said support to another.
Claim 12
Dependent Claim
31 words
Method as claimed in claim 1, in which said heat settable binding agent is selected from the group consisting of phenolic resins, urea-formol resins, epoxy resins, polyester resins, gelatin, and elastomers.
Claim 13
Independent Claim
96 words
A method of making gaskets comprising the steps of projecting in particulate form on at least one surface of a support consistinG of a substantially flattened surface at least 70 parts by weight of a filler material and at most 30 parts by weight of a heat fusible binding agent to form a layer of low density, subjecting the support provided with this layer to a compression which reduces its thickness by 90% and thereby increases its density by at least 10 times, and treating said layer by heat to cause fusion of said binding agent.
Claim 14
Dependent Claim
56 words
Method as claimed in claim 14, comprising the steps of projecting from 70-90 parts of fibers and from 10-30 parts of binding agent, and subjecting the support to a compression reducing the thickness of the sheet to not more than one one-hundredth of its original thickness and thereby increasing its density by at least 100 times.
Claim 15
Dependent Claim
23 words
Method as claimed in claim 14, in which said binding agent is selected from the group consisting of vinyl resins and polyethylene resins.
References Cited (Backward Citations)
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US2753199A
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US2951721A
Cited
US3352080A
Cited
US3311520A
Cited
US3506521A
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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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |