(19)

(11)

EP 0 359 784 A1

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(43) Date of publication: 28.03.1990 Bulletin 1990/13 (21) Application number: 88906693.0 (22) Date of filing: 10.05.1988

(51) International Patent Classification (IPC):  C23C 18/ 36( . ) C23C 18/ 50( . ) C23C 18/ 34( . ) (86) International application number: PCT/US1988/001517 (87) International publication number: WO 1988/008887 (17.11.1988 Gazette 1988/25)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 12.05.1987 US 19870048897 (71) Applicant: McCOMAS, Charles Edward Martinsville, IN 46151 (US)	(72) Inventor: McCOMAS, Charles Edward Martinsville, IN 46151 (US) (74) Representative: Frost, Dennis Thomas, et al  WITHERS & ROGERS 4 Dyer's Buildings Holborn London, EC1N 2JT London, EC1N 2JT (GB)