Method for making an ear plug

Details Method for making an ear plug Method for making an ear plug

1981-03-27

1983-02-08

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

With printing or coating of workpiece

Coating or impregnating workpiece before molding or shaping...

264132, 264161, 264213, 264221, 264222, 2642791, B29C 500, B29C 1710, B29D 300

Patent

active

043729045

ABSTRACT:
Method for making a coded, resilient ear plug including forming an impression with wax and release agent, investing the impression, agitating to remove air, hardening the investment and after removal of the impression material casting a hardenable material in the investment cavity.

REFERENCES:
patent: 1755775 (1930-04-01), Dunn
patent: 2473723 (1949-06-01), Nelson
patent: 2475802 (1949-07-01), Osserman
patent: 2496170 (1950-01-01), Mann
patent: 2528219 (1950-10-01), Feagin
patent: 3097059 (1963-07-01), Hoffman
patent: 3328502 (1967-06-01), Robson
patent: 3440314 (1969-04-01), Gordon
patent: 3638709 (1972-02-01), Brown et al.
Schwartz, "Acrylic Plastics in Dentistry", Dental Items of Interest Pub. Co., N.Y., (1950), pp. 154-155.

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