Patent US4435235A successfully refreshed from Google Patents.
US4435235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gasket manufacture
Assignee: T&N Materials Research Ltd
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Filing: 1981-12-22
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Granted: 1984-03-06
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Expires: 2001-12-22
Abstract
Abstract A method of manufacturing an expanded graphite gasket comprises the steps of taking co-operating male and female mould members, the female mould member comprising a channel extending through a block from one face to a directly opposite face, the channel as seen in plan having a width and configuration corresponding to a desired gasket shape, presenting a substrate to one face of said block with said channel in register with said locations, filling the channel with a charge of expanded graphite particles, followed by pressing the charge with the male mould member onto the substrate to form a gasket thereon and thereafter removing the mould members.
Inventors
- 👤 Alan W. Atkinson
- 👤 Janet M. Lancaster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:43
CPC Classifications
B; B30; B30B; B30B11/00; B30B11/34; B30B15/00; B30B15/02; B30B15/022; C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/536; F; F16; F16J; F16J15/00; F16J15/02; F16J15/14; F28; F28F; F28F3/00; F28F3/08; F28F3/10; Y; Y10; Y10S; Y10S277/00; Y10S277/924
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
141 words
A method of making a flat gasket directly from expanded graphite particles, the method comprising the steps of: (1) providing co-operating male and female mould members, the female mould member being in the form of a channel extending through a block from one face to a directly opposite face, the channel as seen in plan having a width and configuration corresponding to a desired gasket shape, (2) placing a flat, rigid back-up tool in contact with one of said faces, (3) introducing a charge of graphite particles into said channel, (4) placing a gasket substrate into said channel, (5) introducing a second charge of graphite particles into the channel, followed by (6) applying the male mould member and pressing both charges and the substrate against the back-up tool to form a graphite gasket in situ on both sides of the substrate.
Claim 2
Independent Claim
141 words
A method of making a flat gasket directly from expanded graphite particles, the method comprising the steps of: (1) providing co-operating male and female mould members, the female mould member being in the form of a channel extending through a block from one face to a directly opposite face, the channel as seen in plan having a width and configuration corresponding to a desired gasket shape, (2) placing a flat, rigid back-up tool in contact with one of said faces, (3) introducing a charge of graphite particles into said channel, (4) placing a gasket substrate into said channel, (5) introducing a second charge of graphite particles into the channel, followed by (6) applying the male mould member and pressing both charges and the substrate against the back-up tool to form a graphite gasket in situ on both sides of the substrate.
Claim 3
Dependent Claim
30 words
The method of claim 1 including the preliminary step of forming the substrate in the shape of the desired gasket, in plan view as a sliding fit for said channel.
Claim 4
Dependent Claim
29 words
The method of claim 1 including the step of pre-treating the substrate with adhesive in all those locations where it is desired to form a gasket in situ thereon.
Claim 5
Independent Claim
20 words
The method of any preceding claim including the further step of removing from the substrate any unwanted gasket portions thereon.
Claim 6
Dependent Claim
20 words
The method of claim 1 including a further step of pre-treating the expanded graphite particles to increase their bulk density.
Claim 7
Dependent Claim
27 words
The method of claim 5 wherein the particles are milled to increase their bulk density from about 4 to 6 g/liter to about 10 to 40 g/liter.
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) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |