Re: argentotype again
Stane Kocar wrote:
USPO 1.120.580 - Sensitive photographic paper and process of making the same. Patented Dec. 8, 1914.Yes, and GB 20,002 (1913) "Improvements in or relating to Photographic Printing and Paper therefor". Curiously, the European Patent Office does not retrieve the corresponding US patent asking for the INPADOC patent family.