US4097644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inorganic raw felt intended for the production of roof felt
Assignee: Isola Fabrikker AS
•
Filing: 1975-08-05
•
Granted: 1978-06-27
•
Expires: 1995-08-05
Abstract
Abstract An improved raw felt material having a high degree of strength and flexibility and increased bulk. The raw felt is used in producing an asphalt roofing cover. The felt is formed from an adhesively bonded porous non-woven sheet of an inorganic fibrous material and has finally divided vulcanized rubber particles distributed within the fibrous material.
Inventors
- 👤 Harald Thiis Evensen
- 👤 Ola Tellesbo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:04
CPC Classifications
C; C07; C07D; C07D499/00; D; D04; D04H; D04H1/00; D04H1/40; D04H1/413; D04H1/42; D04H1/4209; D04H1/4218; D04H1/4382; D04H1/43835; D04H1/58; D04H1/64; D06; D06M; D06M7/00; D06M7/005; E; E04; E04D; E04D5/00; E04D5/02; Y; Y10; Y10T; Y10T442/00; Y10T442/50; Y10T442/57
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
71 words
A raw felt possessing improved strength, flexibility and bulk, for use in producing an asphalted roofing covering, said raw felt comprising an adhesively bonded porous non-woven sheet of an inorganic fibrous material selected from the group consisting of glass fibers, asbestos fibers and mixtures thereof, and 0.5 - 50% by weight, based on the total weight of the raw felt, of finely divided vulcanized rubber particles distributed with said fibrous material.
Claim 2
Dependent Claim
71 words
A raw felt possessing improved strength, flexibility and bulk, for use in producing an asphalted roofing covering, said raw felt comprising an adhesively bonded porous non-woven sheet of an inorganic fibrous material selected from the group consisting of glass fibers, asbestos fibers and mixtures thereof, and 0.5 - 50% by weight, based on the total weight of the raw felt, of finely divided vulcanized rubber particles distributed with said fibrous material.
Claim 3
Dependent Claim
22 words
Raw felt as defined in claim 1, wherein said finely divided vulcanized rubber particles have a particle size finer than 40 mesh.
Claim 4
Dependent Claim
22 words
Raw felt as defined in claim 2, wherein said finely divided vulcanized rubber particles are particulated members formed from a rubber tire.
Claim 5
Dependent Claim
23 words
Raw felt as defined in claim 2, wherein said finely divided vulcanized rubber particles comprise a mixture of particulated natural and synthetic rubbers.
Claim 6
Dependent Claim
40 words
Raw felt as defined in claim 2, wherein said adhesive for binding said fibrous material is selected from the group consisting of urea formaldehyde, as ester of polyacrylic acid, polyvinyl alcohol having a high degree of hydrolyzation and mixtures thereof.
Claim 7
Dependent Claim
15 words
Raw felt as defined in claim 2, wherein said inorganic fibrous material comprises glass fibers.
Claim 8
Dependent Claim
21 words
Raw felt as defined in claim 7, wherein said inorganic fibrous materials comprises glass fibers admixed with another inorganic fibrous material.
Claim 9
Dependent Claim
16 words
Raw felt as defined in claim 7, wherein said another inorganic fibrous material is glass wool.
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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) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |