Steel material for a colored spring

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United States of America Patent

PATENT NO 5455121
SERIAL NO

08212751

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Abstract

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A steel material for colored springs is formed with a metallic deposit on the surface. The metallic deposit contains copper, zinc, and chromium. In an annealing process, copper and zinc diffuse in the deposit to exhibit a gold color tone while chromium is oxidized to exhibit a dark gray color tone. The combination of these color tones exhibits a beautiful black color tone which is distinguishable from a normal spring. The deposit improves the formability in the spring shaping process.

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Patent Owner(s)

Patent OwnerAddress
SHINKO KOSEN KOGYO KABUSHIKIKAISHA (ALSO KNOWN AS SHINKO WIRE COMPANY LTD ) 10-1 NAKAHAMACHO AMAGASAKI-SHI HYOGEN-KEN

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hattori, Keiji Kobe, JP 3 10
Kubo, Takashi Osaka, JP 267 2077
Ueki, Hirofumi Kobe, JP 3 11
Yamada, Masao Takaishi, JP 53 575

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Citation count rangeNumber of patents cited in rangeNumber of patents cited in various citation count ranges2452830315775432011752601 - 1011 - 2021 - 3031 - 4041 - 5051 - 6061 - 7071 - 8081 - 9091 - 100100 +0255075100125150175200225250275300325350375400425450475500525550575

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