US4271228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet material containing exfoliated vermiculite
Assignee: Hollingsworth and Vose Co
•
Filing: 1980-02-04
•
Granted: 1981-06-02
•
Expires: 2000-02-04
Abstract
Abstract Flexible sheet material adapted for use as heat resistant gaskets, heat insulation, eletrical insulation and support media in the form of a bonded fibrous web containing vermiculite, organic fibers and binder material.
Inventors
- 👤 Richard P. Foster
- 👤 Gregory C. Brodin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:49
CPC Classifications
C; C04; C04B; C04B26/00; C04B26/02; F; F16; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/064; F16J15/065; F16J15/10; F16J15/102; F28; F28F; F28F3/00; F28F3/08; F28F3/10; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91; Y10; Y10S; Y10S277/00; Y10S277/919; Y10S277/935; Y10S277/936; Y10S428/00; Y10S428/92; Y10T; Y10T428/00; Y10T428/25; Y10T428/251; Y10T428/252; Y10T428/256; Y10T442/00; Y10T442/50; Y10T442/51; Y10T442/53
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
182 words
A sheet material adapted for use as heat resistant gaskets, heat insulation, electrical insulation, and supporting media for dehumidifiers and heat exchangers, said material being in the form of a fibrous web comprising organic fiber, organic binder, and a blend of completely exfoliated vermiculite free from asphalt with another inorganic asbestos-free particulate filler, said blend having a particle size to pass a No. 80 screen, the amount of said fiber being from 1 to 30% by weight and the amount of said blend being from 70 to 99% by weight, the amount of binder being from 3 to 30% by weight, all based on the total weight of fiber and blend, and the amount of vermiculite being from 25 to 70% by weight of said blend, said sheet material having a density of 0.64 to 1.92 g per cc, a tensile strength of at least 500 psi, a compression of 7 to 50% and a recovery of 20 to 70% at 1000 psi, a sealability of 30 cc/hr maximum at 500 psi, and a stress relaxation of 50% maximum at 212° F.
Claim 2
Dependent Claim
182 words
A sheet material adapted for use as heat resistant gaskets, heat insulation, electrical insulation, and supporting media for dehumidifiers and heat exchangers, said material being in the form of a fibrous web comprising organic fiber, organic binder, and a blend of completely exfoliated vermiculite free from asphalt with another inorganic asbestos-free particulate filler, said blend having a particle size to pass a No. 80 screen, the amount of said fiber being from 1 to 30% by weight and the amount of said blend being from 70 to 99% by weight, the amount of binder being from 3 to 30% by weight, all based on the total weight of fiber and blend, and the amount of vermiculite being from 25 to 70% by weight of said blend, said sheet material having a density of 0.64 to 1.92 g per cc, a tensile strength of at least 500 psi, a compression of 7 to 50% and a recovery of 20 to 70% at 1000 psi, a sealability of 30 cc/hr maximum at 500 psi, and a stress relaxation of 50% maximum at 212° F.
Claim 3
Dependent Claim
24 words
A sheet material as claimed in claim 1 in which the amount of vermiculite is from 25 to 35% by weight of said blend.
Claim 4
Dependent Claim
38 words
A sheet material as claimed in claims 1 or 2 in which the amount of said organic fiber is from 5 to 20% by weight and the amount of said binder is from 5 to 20% by weight.
Claim 5
Dependent Claim
67 words
A sheet material as claimed in claim 2 in which the amount of said organic fiber is from 5 to 20% by weight and the amount of said binder is from 5 to 20% by weight, said sheet material having a sealability from 5 cc/hr to 30 cc/hr at 500 psi, and a stress relaxation from 5 to 40%, suitable for use as a heat resistant gasket.
Claim 6
Dependent Claim
16 words
A sheet material as claimed in claim 4 having a crush resistance from 5 to 70%.
References Cited (Backward Citations)
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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) | 1984-06-01 | 1984-12-01 | 1985-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-01 | 1988-12-01 | 1989-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-01 | 1992-12-01 | 1993-06-02 | $7700.00 | Window Closed / Lapsed |