US4192697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot applied coatings
Assignee: Winn and Coales Denso Ltd
•
Filing: 1978-03-15
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Granted: 1980-03-11
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Expires: 1998-03-15
Abstract
Abstract A method for forming an adherent protective coating on articles, particularly pipes for burial in the ground where they will be subject to corrosion, which comprises wrapping a hot impregnated fabric strip spirally around the article, the said fabric, which is preferably of glass fibre, being impregnated with a hot, molten adhesive, e.g. coal tar or bitumen and forming a sheathing of a plastics material bonded to the impregnated fabric, preferably by winding a strip of polyvinyl chloride sheet over the wrapped article.
Inventors
- 👤 William D. Parker
- 👤 Harry M. Smith
- 👤 Margaret P. Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:14
CPC Classifications
F; F16; F16L; F16L58/00; F16L58/02; F16L58/16; Y; Y10; Y10S; Y10S138/00; Y10S138/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
55 words
A method for forming a protective coating on a pipe which method comprises wrapping a hot fabric strip helically over the pipe, the said fabric strip having been previously impregnated with a hot, molten adhesive, and wrapping a strip of plasticized polyvinyl chloride sheet under tension over the hot fabric wrapping to form a sheathing.
Claim 2
Independent Claim
55 words
A method for forming a protective coating on a pipe which method comprises wrapping a hot fabric strip helically over the pipe, the said fabric strip having been previously impregnated with a hot, molten adhesive, and wrapping a strip of plasticized polyvinyl chloride sheet under tension over the hot fabric wrapping to form a sheathing.
Claim 3
Dependent Claim
14 words
A method as claimed in claim 1 wherein the pipe is a steel pipe.
Claim 4
Dependent Claim
18 words
A method as claimed in claim 1 wherein the fabric strip is a strip of glass fibre felt.
Claim 5
Dependent Claim
24 words
A method as claimed in claim 3 wherein the glass fibre fabric is impregnated by being passed through a bath of hot molten adhesive.
Claim 6
Dependent Claim
49 words
The process as defined in claim 4, which comprises the steps of passing the fabric strip through a bath of the hot molton adhesive to obtain a completely adhesive-impregnated fabric strip and removing excess adhesive from the fabric strip to obtain an impregnated hot fabric strip of uniform thickness.
Claim 7
Dependent Claim
23 words
The process as defined in claim 5, wherein the thickness of the impregnated hot fabric strip is from about 0.75 to 2.00 mm.
Claim 8
Dependent Claim
25 words
The process as defined in claim 1, wherein the adhesive is an adhesive having a softening point of between about 55° and about 110° C.
Claim 9
Dependent Claim
29 words
A method as claimed in claim 1 wherein the adhesive is selected from the group consisting of asphaltic bitumen, coal tar and rubber containing asphaltic bitumen and coal tar.
Claim 10
Dependent Claim
36 words
A method as claimed in claim 1 wherein a first and a second layer of hot impregnated fabric are superposed on the article, the first layer having a softer adhesive impregnated therein than the second layer.
Claim 11
Independent Claim
106 words
A method for forming a protective coating on a steel pipe which method comprises heating the pipe, priming the pipe, wrapping a hot, impregnated glass fibre fabric strip helically around the hot pipe with an overlap between successive turns of at least 10%, the fabric strip having been impregnated by being passed through a bath of molten adhesive selected from the group consisting of asphaltic bitumen coal tar and rubber containing asphaltic bitumen and coal tar, and helically winding under tension a strip of plasticised polyvinyl chloride sheet coated with the said adhesive over the impregnated fabric whilst the fabric is hot to form a sheathing.
Claim 12
Independent Claim
106 words
A method for forming a protective coating on a steel pipe which method comprises heating the pipe, priming the pipe, wrapping a hot, impregnated glass fibre fabric strip helically around the hot pipe with an overlap between successive turns of at least 10%, the fabric strip having been impregnated by being passed through a bath of molten adhesive selected from the group consisting of asphaltic bitumen coal tar and rubber containing asphaltic bitumen and coal tar, and helically winding under tension a strip of plasticised polyvinyl chloride sheet coated with the said adhesive over the impregnated fabric whilst the fabric is hot to form a sheathing.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-11 | 1983-09-10 | 1984-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-11 | 1987-09-10 | 1988-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-11 | 1991-09-10 | 1992-03-11 | $7700.00 | Window Closed / Lapsed |