In this use the unexposed Kalvar was placed back-to-back with the original, and exposed to collimated UV light.
12.
Kalvar had been in use for some time when a serious problem was discovered-when the saran plastic broke down it gave off hydrochloric acid.
13.
He proposed a new version of Walnut that replaced the Kalvar developer with an automated diazo film developer system that developed the film in a few minutes.
14.
Kalvar's work has been featured in solo and group exhibitions in France, including at Agathe Gaillard gallery and at Maison Europ�enne de la Photographie in Paris.
15.
Since Kalvar film used no chemicals for processing, the equipment needed to use it was limited only by the speed of the transport mechanism and the power of the ultraviolet light.
16.
He quickly concluded that Kalvar was not stable enough to store data with the sort of reliability IBM demanded, breaking down over a period of a few years and giving off corrosive gas while it did so.
17.
The diazo-copying process is not unique to Kalvar; the basic process was already widely used in other copying processes, including the " whiteprint " paper copying system and a number of commercial microfilm copying systems.
18.
This eventually led to Xidex suing Kalvar for patent infringement, but when Kalvar demonstrated that they had been shipping commercial versions of their film in 1957, over a year before the Xidex filing, Xidex lost the suit.
19.
This eventually led to Xidex suing Kalvar for patent infringement, but when Kalvar demonstrated that they had been shipping commercial versions of their film in 1957, over a year before the Xidex filing, Xidex lost the suit.
20.
Kalvar is based on a diazo film and Kuehler was able to identify a similar film that would provide the reliability required, although at the price of needing to be developed in a " wet lab " process.
