Title: Process for fabrication of decorative panel

Abstract: A method for the fabrication of a decorative panel having a coarse, enlarged crystalline pattern characterized by applying a large rolling force at a draft ratio in excess of the critical draft ratio to a metal sheet; annealing the metal sheet at a temperature in excess of the recrystallization temperature in order to remove deformations caused by the rolling step; applying a prescribed pattern-like strain figures thereto; annealing the metal sheet in an anti-oxidizing atmosphere at a high temperature in excess of the recrystallization temperature in order to allow coarse, enlarged crystals to form; and subsequently etching the surface of the sheet.

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Inventors: Watanabe, Kisuke (Tokyo, JA)
Takasugi, Tsuneji (Iruma, JA)

Application Number: 752600
Filing Date: 1976-12-20
Publication_date: 1978-04-18
Assignee: Citizen Watch Company Limited (Tokyo, JA)
Primary Class(es): 148/684 148/678, 148/687, 148/708
Other Classes:
US Patent Ref:

2941930	Jun, 1960	Mostovych et al.	148/11.
3180806	Apr, 1965	Hollingsworth	148/11.
3773576	Nov, 1973	Pond	148/11.
3827952	Aug, 1974	Franz	148/11.
3891472	Jun, 1975	Yoshida et al.	148/11.

Other Refs:
Primary Examiner: Stallard, W.
Assistant Examiner:
Attorney: Jordan; Frank J.