(19)

(11)

EP 0 041 946 A1

(12)

(43) Date of publication: 23.12.1981 Bulletin 1981/51 (21) Application number: 80900828.0 (22) Date of filing: 19.12.1979

(51) International Patent Classification (IPC):  B22D 17/ 22( . ) B22D 17/ 00( . ) B29C 45/ 00( . ) E04B 1/ 19( . ) F24J 2/ 20( . ) B22C 9/ 22( . ) B29C 33/ 00( . ) B29C 45/ 26( . ) E04C 2/ 34( . ) (86) International application number: PCT/US1979/001110 (87) International publication number: WO 1981/001807 (09.07.1981 Gazette 1981/16)

(84) Designated Contracting States: AT DE FR GB NL SE (71) Applicant: HARDIGG INDUSTRIES, INCORPORATED South Deerfield Massachusetts 01373 (US)	(72) Inventor: HARDIGG, James Sutton Conway, MA 01373 (US) (74) Representative: Knowles, Audrey Elizabeth  624 Pershore Road Selly Park Birmingham B29 7HG Selly Park Birmingham B29 7HG (GB)