US4289172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced bitumen pipes and process for their manufacture
Assignee: Individual
•
Filing: 1979-05-01
•
Granted: 1981-09-15
•
Expires: 1999-05-01
Abstract
Abstract A reinforced bitumen pipe has an inner, strength-providing, reinforced thermosetting resin layer which is coated on its inner and outer sides with a bitumen layer. The bitumen layer on the inner side, and preferably also the bitumen layer on the outer side, is separated from the strength-providing reinforced thermosetting resin layer with the aid of an insulating glass fiber layer into which the thermosetting resin and the bitumen partially penetrate without finding their way up to each other.
Inventors
- 👤 Stig O. M. Ekstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:57
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/14; Y; Y10; Y10S; Y10S138/00; Y10S138/02; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31616; Y10T428/3162; Y10T428/31815
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
75 words
A reinforced bitumen pipe, characterized in that it has an insulating glass fiber layer which on its inner side is united with an inner bitumen layer partially penetrating into the glass fiber layer and which on its outer side is united with a strength-providing layer of reinforced thermosetting resin partially penetrating into the glass fiber layer without reaching the bitumen layer, said strength-providing layer being coated on its outer side with an outer bitumen layer.
Claim 2
Dependent Claim
75 words
A reinforced bitumen pipe, characterized in that it has an insulating glass fiber layer which on its inner side is united with an inner bitumen layer partially penetrating into the glass fiber layer and which on its outer side is united with a strength-providing layer of reinforced thermosetting resin partially penetrating into the glass fiber layer without reaching the bitumen layer, said strength-providing layer being coated on its outer side with an outer bitumen layer.
Claim 3
Dependent Claim
21 words
A pipe as claimed in claim 1, characterized in that said insulating glass fiber layer comprises densely woven glass fiber roving.
Claim 4
Dependent Claim
17 words
A pipe as claimed in claim 1, characterized in that the strength providing layer comprises reinforced polyester.
Claim 5
Dependent Claim
29 words
A pipe as claimed in any one of claims 1 to 3 in which said outer bitumen layer has an outer coat of particulate material attached to its surface.
Claim 6
Dependent Claim
26 words
A pipe as claimed in claim 4 characterized in that both of said bitumen layers are reinforced with a glass fiber layer entirely impregnated with bitumen.
Claim 7
Dependent Claim
26 words
A pipe as claimed in claim 4 characterized in that one of said bitumen layers is reinforced with a glass fiber layer entirely impregnated with bitumen.
Claim 8
Dependent Claim
104 words
A reinforced bitumen pipe, comprising an insulating glass fiber layer which on its inner side is united with an inner bitumen layer partially penetrating into the glass fiber layer and which on its outer side is united with a strength-providing layer of reinforced thermosetting resin partially penetrating into the glass fiber layer without reaching the bitumen layer, said strength-providing layer being coated on its outer side with an outer bitumen layer which is separated from the strength-providing layer by means of a glass fiber layer in which the strength-providing layer and the outer bitumen layer partially penetrate from opposite sides without reaching one another.
Claim 9
Dependent Claim
104 words
A reinforced bitumen pipe, comprising an insulating glass fiber layer which on its inner side is united with an inner bitumen layer partially penetrating into the glass fiber layer and which on its outer side is united with a strength-providing layer of reinforced thermosetting resin partially penetrating into the glass fiber layer without reaching the bitumen layer, said strength-providing layer being coated on its outer side with an outer bitumen layer which is separated from the strength-providing layer by means of a glass fiber layer in which the strength-providing layer and the outer bitumen layer partially penetrate from opposite sides without reaching one another.
Claim 10
Dependent Claim
23 words
A pipe as claimed in claim 7, characterized in that one of said insulating glass fiber layers comprises densely woven glass fiber roving.
Claim 11
Dependent Claim
17 words
A pipe as claimed in claim 7, characterized in that the strength providing layer comprises reinforced polyester.
Claim 12
Dependent Claim
29 words
A pipe as claimed in any one of claims 7 to 9 in which said outer bitumen layer has an outer coat of particulate material attached to its surface.
Claim 13
Dependent Claim
26 words
A pipe as claimed in claim 10, characterized in that one of said bitumen layers is reinforced with a glass fiber layer entirely impregnated with bitumen.
Claim 14
Dependent Claim
26 words
A pipe as claimed in claim 10 characterized in that both of said bitumen layers are reinforced with a glass fiber layer entirely impregnated with bitumen.
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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) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |