Coal tar enamel coated steel pipe and process for producing same

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United States of America Patent

PATENT NO 5567480
SERIAL NO

08351700

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Abstract

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Described is a method for manufacturing a coal tar enamel-coated steel pipe, in which a primer coat of epoxy resin is applied to a preheated steel pipe, and coal tar enamel is applied to the primer coat prior to full curing of the latter. The resulting coated steel pipes, which also are described, exhibit excellent resistance to cathodic disbondment, heat and water. In some embodiments the primer includes a silane coupling agent.

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Patent Owner(s)

Patent OwnerAddress
LONE STAR SPECIALTY PRODUCTS LLC4200 E SKELLY DRIVE SUITE 600 TULSA OK 47135

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Henegar, C Sherill Franklin, IN 3 6
Johnson, John R Danville, IN 64 1186
Roder, William R Indianapolis, IN 5 30

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  • 2 Citation Count
  • B05D Class
  • 3.29 % this patent is cited more than
  • 29 Age
Citation count rangeNumber of patents cited in rangeNumber of patents cited in various citation count ranges193071366418135234601 - 1011 - 2021 - 3031 - 4041 - 5051 - 6061 - 7071 - 8081 - 90100 +020406080100120140160180200220240260280300320340

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