Last Updated: Aug 11, 2016 Views: 62
The references I have found to Désagnat seem to reference the 1930s and 1940s. We have one trade catalog “Verre-mural Désagnat" which I scanned and am attaching to this reply. I checked the French directories of glass companies for the 1930s and did not find any references to a company with that name. However, you may want to look at issues of Glaces et Verres for that time period to see if they were advertising products in that publication.
The trade catalog provides some information on architectural projects for which Désagnat supplied glass, so if any of those establishments are still in existence, they may have records which will be of use to you. I am also sending you a link to some patents filed by Gaston Désagnat which describe a process of creating inexpensive walls and wall coverings, using a technique he invented.
The French patent number appears to be No. 1,930,740, dated October 17, 1933, Serial No. 506,962, January 6, 1931, although we don’t own a copy of that.
Désagnat also filed a lawsuit against someone who he claimed was using his processes in the 1940s. Désagnat v. Morgan (1949) United States Patent Quarterly vol. 82. We don’t have a copy but you can request it from another library via Interlibrary Loan.
Please let me know if I can be of further service.