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18 January 2008. Arturo Quirantes (www.cripto.es) sends:

Concerning your post about early Enigma patents (http://cryptome.org/enigma-1920s.htm), I also found a bunch of crypto patents at the Spanish Patent Office.  One of then is identical to the one you show at Cryptome.  Only it's issued to Naamlooze Vennotschap Ingenieursbureau Securitas (Hogu Koch's business), and is dated May 1924!

Please find a picture of one of the patent's pages (a diagram) at:


plus a few other comments on old patents at

http://www.cripto.es/museo/patentes.htm (spanish/english)

and an article I wrote about it at


(spanish only, sorry)

17 January 2008

Mr. Schlesinger has provided the patent:

http://cryptome.org/scherbius-1928.pdf (7 pp, 716KB)

16 January 2008

Cryptome has asked Mr. Schlesinger for more information on the Enigma-like machine. Nothing was found on

From: "Robert Schlesinger" <mathtech[at]earthlink.net>
To: TSCM-L2006[at]googlegroups.com, "TSCM-L Professionals List" <TSCM-L2006[at]googlegroups.com>
Cc: garya_curtis[at]hotmail.com, "Econophysics" <mathtech[at]earthlink.net>
Subject: [TSCM-L] {2282} Re: Classified Patents
Date: Mon, 14 Jan 2008 13:25:12 -0800

Dear Friends,

During my nearly 30 years being licensed to practice before the U.S. Patent
and Trademark Office ("PTO"), I have occasionally come across this problem,
where a Secrecy Order is placed on a pending patent application, or more
significantly, on an issued patent.    Copies of the issued patent are then
removed from the data banks and government depository libraries, and are
then most difficult to obtain.    

I have found that secrecy orders tend to be on technologies related to
cryptography and chemical weapons technology.        

For example, some of the Friedman patent applications from the
early-1930's, for Enigma-like devices were not declassified and "issued"
until the mid-1990's (#'s 6,097,812 and 6,130,946). [By the way, an
applicable version of the Enigma machine was patented in the U.S. by a
Berliner during the late-1920's, so all this secrecy and the early efforts
by the Polish, French, and Hungarian intelligence services, and later by
the British and U.S. intelligence services was to some extent a fantastic
mathematical exercise, as the machine had been largely disclosed in an
issued U.S. patent.]    

And, for example, an issued 1960's patent disclosing how to isolate ricin
was recently classified and removed from almost all available patent
records.    Old issues of the Official Gazette, the PTO's patent
abstracting service, still contain record and abstract of the patent. 

A skilled patent practitioner may write a patent application and its claims
so as to not arouse unfair suspicion of those at the PTO evaluating the
patent application (during the pre-examination process for foreign filing
licenses and possible application of a secrecy order).

Electronic surveillance patent applications may be written to emphasize
commercial and retaining, or even biomedical or animal tracking
applications and claims.

I hope this is interesting or useful to some group members.

Best regards,
Robert Schlesinger
Rancho Cucamonga, CA