Method and apparatus for duplicating by means of ammonia gas

Details Method and apparatus for duplicating by means of ammonia gas Method and apparatus for duplicating by means of ammonia gas

1977-09-06

1980-04-22

Hix, L. T.

354300, 354317, 34219, G03D 700

Patent

active

041992490

ABSTRACT:
Copies or duplicates are made from a suitable original such as a silver f or a diazofilm onto a further diazofilm by circulating the ammonia gas in a closed, evacuated circuit including the developing chamber. The ammonia gas is compressed in the developing chamber and expanded again as it is returned to a heatable supply chamber. The apparatus includes a closed circuit arrangement between the supply chamber and the developing chamber as well as an evacuating device connected to the developing chamber.

REFERENCES:
patent: 1904551 (1933-04-01), Smith
patent: 3364833 (1968-01-01), Mulvany
patent: 3524397 (1970-08-01), Hruby
patent: 3535997 (1970-10-01), Blake
patent: 3720150 (1973-03-01), Hurtig et al.
patent: 3900862 (1975-08-01), Bennett et al.
patent: 3915708 (1975-10-01), Zausmer et al.
patent: 3986191 (1976-10-01), Ackerman et al.
patent: 4010478 (1977-03-01), Jantzen
patent: 4048645 (1977-09-01), Reams

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