Concrete pipe with an inner lining
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 19, 1985
Issued Date -
N/A
app pub date -
Mar 22, 1984
filing date -
Apr 7, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A concrete pipe of the type employed, for example, in large sewers is described, having a concrete wall and an inner lining sheet of a polymeric or other plastic material anchored to the wall by a layer of fabric welded or otherwise firmly connected to the sheet. The fabric includes a plurality of preferably monofilament projections having a higher modulus of elasticity than the material of the sheet which projections extend into the inner wall of the concrete pipe and anchor the fabric and sheet thereto. A protective plastic ring and a covering strip positively support the sheet at the joint between two pipes.
First Claim
Family
International Classification(s)
- Non-US Classification not provided for expired patents
Cited Art Landscape
Patent Citation Ranking
- Citation Ranking not provided for expired patents
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