Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Structurally defined
Patent
1984-02-28
1984-09-25
Louie, Won H.
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Structurally defined
430599, 354300, G03C 128
Patent
active
044736363
ABSTRACT:
A process is disclosed for increasing the sensitivity of photographic film wound on a roll or film cartridge. The film is treated by soaking in a dilute atmosphere of hydrogen mixed with a non-reactive gas, such as nitrogen, at relatively low temperatures for long time periods. The apparatus includes a hermetically sealed chamber for the film, a pressure gauge, and valves together with a vacuum pump and gas source for administering the film treatment. An alternative version includes a heater for the chamber. The treated film exhibits enhanced sensitivity to electromagnetic radiation, reduced low-intensity reciprocity law failure, and improved accuracy of color rendition.
REFERENCES:
patent: 3542557 (1970-11-01), Illingsworth et al.
patent: 3622324 (1971-11-01), Lewis et al.
patent: 3891446 (1975-06-01), Janusonis
patent: 3984249 (1976-10-01), Babcock et al.
Choong Shin-Piaw, "Influence of Pneumatic Pressure on the Photographic Sensitivity", May, 1944, pp. 285-289, Journal of the Optical Society of America, vol. 34.
R. L. Scott, A. G. Smith and R. J. Leacock, "The Use of Forming Gas in Hypersensitizing Kodak Plates", 1977, A.A.S. Photo-Bulletin, No. 15, pp. 12-15.
Alex G. Smith and Hans W. Schrader, "Balanced Hypersensitization of a Fast Reversal Color Film", 1979, A.A.S. Photo-Bulletin, No. 21, pp. 9-13.
Lewis Francis H.
Louie Won H.
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