US4387178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compressible soft asbestos free gasket material
Assignee: Rogers Corp
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Filing: 1981-11-02
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Granted: 1983-06-07
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Expires: 2001-11-02
Abstract
Abstract A gasket material comprised of fibrillated aramid fibers, diatomaceous earth and either a polyethylacrylic or polybutylacrylic latex alone or in combination with conventional curatives, antioxidants and pigments. The constituent materials are combined in a beater-addition process, and the pliable gasket material is then formed on conventional paper making equipment.
Inventors
- 👤 Douglas H. Tracy
- 👤 Jeffrey B. Otto
- 👤 Bruce M. Arnio
- 👤 Elizabeth L. Callan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:47
CPC Classifications
C; C08; C08L; C08L33/00; C08L33/04; C08L33/06; C08L33/08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/34; C08K3/36; C08K7/00; C08K7/02; C08L61/00; C08L61/04; C08L61/06; C08L77/00; C08L2205/00; C08L2205/14; C08L2205/16; C08L77/10; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/936; Y10T; Y10T428/00; Y10T428/25; Y10T428/252; Y10T428/259; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2969; Y10T428/2973; Y10T428/298; Y10T428/31504; Y10T428/31725; Y10T428/31761
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
69 words
A compressible soft asbestos free gasket material comprising: 5-40% of the total solids being fibrillated aramid fibers; 25-85% of the total solids being diatomaceous earth; 0.5-10% of the total solids being phenolic resin; 5-25% of the total solids being a polyacrylic latex selected from the group consisting of ethylacrylates, butylacrylates and combinations thereof; and 1-10% of the total solids being selected from the group including crosslinker, antioxident, and pigments.
Claim 2
Dependent Claim
69 words
A compressible soft asbestos free gasket material comprising: 5-40% of the total solids being fibrillated aramid fibers; 25-85% of the total solids being diatomaceous earth; 0.5-10% of the total solids being phenolic resin; 5-25% of the total solids being a polyacrylic latex selected from the group consisting of ethylacrylates, butylacrylates and combinations thereof; and 1-10% of the total solids being selected from the group including crosslinker, antioxident, and pigments.
Claim 3
Dependent Claim
19 words
The gasket material of claim 1 wherein said diatomaceous earth is of a particle size ranging between 1-100 microns.
Claim 4
Dependent Claim
11 words
The gasket material of claim 1 wherein said crosslinker is acrylonitrile.
Claim 5
Dependent Claim
24 words
The gasket material of claim 1 wherein said polyacrylic latex comprises: 1% to 70% of a polyacrylic solid and a small amount of acrylonitrile.
Claim 6
Dependent Claim
18 words
The gasket material of claim 4 wherein said polyacrylic solid is comprised of 90% polyacrylic and 10% acrylonitrile.
Claim 7
Dependent Claim
28 words
The gasket material of claim 1 wherein said aramid fibers are of a length ranging between one-half and 4 millimeters and a diameter between 0.001 to 0.0035 millimeters.
References Cited (Backward Citations)
US3600269A
Cited
US3788651A
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US3956566A
Cited
US3969568A
Cited
US4320823A
Cited
US4330442A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-06 | 1986-12-06 | 1987-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-06 | 1990-12-06 | 1991-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-06 | 1994-12-06 | 1995-06-07 | $7700.00 | Window Closed / Lapsed |