Alberto,
I get the first page 1899674 but 334904 gives me something else, a "yarn
stripper". Could you check the number again. Thank you. It's coincidentally
something I'm very interested in.
~m
----- Original Message -----
From: "Alberto Novo" <alt-list@albertonovo.it>
To: "alt-list" <alt-photo-process-L@sask.usask.ca>; "alt-list_L"
<alt-photo-process-L@usask.ca>
Sent: Tuesday, February 14, 2006 4:23 AM
Subject: patents
> Searching old patents related to alt-photo techniques I have found some
> interesting ones.
> For example, by means of the British Esp@cenet site
> (http://gb.espacenet.com/) I have found the beautiful Manly's ones:
> GB189810026 (ozobrome, 1898) and GB190517007 (carbro, 1905).
> Though the US patens database (http://www.uspto.gov/patft/index.html) does
> not allow the complex search on patens before 1976, I have been able to
find
> a 1933 patent on the preparation of ferric oxalate by oxidation of ferrous
> oxalate with hydrogen peroxide (Leo P. Curtin, US1899674 and CA334904).
> Esp@cenet gives also a 1985 patent for the preparation of iron(III)
ammonium
> oxalate (PL245415) without any text, and I am not able to find it using
the
> Polish database.
>
> Finally, I wish to bring your attention to a very recent "A method for
> making internegative" (JP2004058378). See
> http://v3.espacenet.com/textdoc?DB=EPODOC&IDX=JP2004058378&F=0 (all in one
> line).
> It is entirely written in Japanese, but look at the images in the last two
> pages!!!
>
> Alberto
Received on Tue Feb 14 23:53:37 2006
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