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US4213530A Expired / Lapsed US ⏱️ 0.0 years remaining

Containerized pipe coating material

Assignee: Bredero Price Inc
•
Filing: 1979-02-12
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Granted: 1980-07-22
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Expires: 1999-02-12
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Abstract

Abstract An improved containerized pipe coating including coating material and the container therefor is the subject of the present invention. An asphalt coating material comprising 10% to 25% by weight asphalt and 75% to 90% by weight sand-lime aggregate is used to coat the weld joints of pipe previously coated with similar material along its length for corrosion protection. The weld joint coating material is delivered to a coating station in easy to handle small size containers. The containers comprise no more than about 5% of the weight of the material contained thereby and are constructed primarily from a material containing at least one of the members of the group consisting of polyethylene, polypropylene and polyethylene-polypropylene copolymer. The containerized material is placed in a chopper where it is reduced in size. The chopped mixture of particles are then melted and stirred until a relatively even mixture of a flowable liquid is presented. The mixture has enhanced physical properties as a coating material.

Inventors

  • 👤 Robert J. Harris
  • 👤 Gail T. Sikes

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 06:56
CPC Classifications
B; B65; B65D; B65D65/00; B65D65/38; B65D65/46; B65D81/00; Y; Y10; Y10S; Y10S206/00; Y10S206/819

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 87 words
An improved containerized pipe coating including an asphalt base coating material comprising about 10% to 25% by weight asphalt and about 75% to 90% by weight aggregate, and a container capable of being melted and mixed with said material to enhance the physical properties thereof, said container comprising no more than about 5% by weight of the coating material contained thereby and said container being constructed primarily from a material containing at least one of the members of the group consisting of polyethylene, polypropylene, and polyethylene-polypropylene copolymer.
Claim 2
Dependent Claim 87 words
An improved containerized pipe coating including an asphalt base coating material comprising about 10% to 25% by weight asphalt and about 75% to 90% by weight aggregate, and a container capable of being melted and mixed with said material to enhance the physical properties thereof, said container comprising no more than about 5% by weight of the coating material contained thereby and said container being constructed primarily from a material containing at least one of the members of the group consisting of polyethylene, polypropylene, and polyethylene-polypropylene copolymer.
Claim 3
Dependent Claim 34 words
The invention as set forth in claim 1, wherein said container consists of about 10% to 15% by weight polyethylene, about 10% to 15% by weight polypropylene-polyethylene copolymer and about 70% to 80% polypropylene.
Claim 4
Dependent Claim 26 words
The invention as set forth in claim 2, wherein said container is constructed from material characterized by a melt flow index of about 3.5 to 5.0.
Claim 5
Dependent Claim 16 words
The invention as set forth in claim 1, wherein said aggregate comprises crushed stone and sand.
Claim 6
Dependent Claim 24 words
The invention as set forth in claim 4, wherein said asphalt is characterized by a flash point of no less than about 450° F.
Claim 7
Dependent Claim 48 words
The invention as set forth in claim 1, wherein said container consists of from 10% to 15% by weight polyethylene, from 10% to 15% by weight polypropylene-polyethylene copolymer and from 70% to 80% polypropylene, and said container comprises about 1.7% by weight of the coating material contained thereby.

References Cited (Backward Citations)

US2352865A Cited
US2572959A Cited
US2762504A Cited
US2791327A Cited
US3362575A Cited
US3419258A Cited
US3902596A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1983-07-22 1984-01-21 1984-07-22 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1987-07-22 1988-01-21 1988-07-22 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1991-07-22 1992-01-21 1992-07-22 $7700.00 Window Closed / Lapsed

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