Patent US4153748A successfully refreshed from Google Patents.
US4153748A
Expired / Lapsed
US
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Weather-resistant vulcanizable covering
Assignee: Carl Freudenberg KG
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Filing: 1977-06-20
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Granted: 1979-05-08
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Expires: 1997-06-20
Abstract
Abstract A weather-resistant covering is made of three superimposed sheets of vulcanizable material such as ethylene-propylene copolymers, e.g. ethylene-propylene-diene terpolymer. The inner layer contains a vulcanization accelerator and advantageously the outer layers do not. An additional inner layer such as a non-woven textile fabric can be provided to increase strength and dimensional stability. A roof can be covered by placing a plurality of strips of such covering side-by-side with slight overlap, welding them together into impervious seams by application of a volatile solvent or swelling agent for the outer layers.
Inventors
- 👤 Dieter Bischoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:06
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C65/00; B29C65/48; B29C65/4895; B29C66/00; B29C66/70; B29C66/71; B32B25/00; B32B25/04; B32B25/10; B32B27/12; B32B5/00; B32B5/02; B32B5/022; B32B5/024; E; E04; E04D; E04D5/00; E04D5/10; B32B38/00; B32B2038/0052; B32B2038/0076; B32B2305/00; B32B2305/72; B32B2307/00; B32B2307/70; B32B2307/726; B32B2307/7265; B32B2323/00; B32B2323/16; B32B2419/00; B32B2419/06; Y; Y10; Y10T; Y10T428/00; Y10T428/19; Y10T428/192; Y10T428/197; Y10T428/198; Y10T428/31504; Y10T428/31652; Y10T428/31667; Y10T428/31826; Y10T428/31833; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917; Y10T428/31924; Y10T428/31928
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
40 words
A covering made of vulcanizable material, resistant to the effects of water and weather, comprising at least three superimposed vulcanizable sheets, at least one inner layer being elastomeric and containing a vulcanization accelerator, at least the outer layers being weldable.
Claim 2
Dependent Claim
40 words
A covering made of vulcanizable material, resistant to the effects of water and weather, comprising at least three superimposed vulcanizable sheets, at least one inner layer being elastomeric and containing a vulcanization accelerator, at least the outer layers being weldable.
Claim 3
Dependent Claim
15 words
A covering according to claim 1, wherein the outer layers are free of vulcanization accelerator.
Claim 4
Dependent Claim
15 words
A covering according to claim 1, wherein each of the sheets comprises an ethylene-propylene-diene terpolymer.
Claim 5
Dependent Claim
33 words
A covering according to claim 1, wherein at least one inner layer comprises an ethylene-propylene-diene terpolymer, and the upper and lower outer layers comprise a vulcanizable mixture of ethylene-propylene-diene terpolymer and ethylene-propylene copolymer.
Claim 6
Dependent Claim
19 words
A covering according to claim 1, including at least one additional inner layer of woven or non-woven textile material.
Claim 7
Dependent Claim
56 words
A covering according to claim 1, wherein the outer layers are free of vulcanization accelerator, each of the three sheets comprises an ethylene-propylene-diene terpolymer, the upper and lower outer layers comprise a vulcanizable mixture of ethylene-propylene-diene terpolymer and ethylene-propylene copolymer, and the covering including at least one additional inner layer of woven or non-woven textile material.
Claim 8
Dependent Claim
18 words
A covering according to claim 1 in side-by-side overlapping relationship with and welded to a further like cover.
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) | 1982-05-07 | 1982-11-06 | 1983-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-07 | 1986-11-06 | 1987-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-07 | 1990-11-06 | 1991-05-08 | $7700.00 | Window Closed / Lapsed |