United States Cryptography Patents on CD-ROM!

Here is a complete collection of United States cryptography patents on CD-ROM: nearly 1,000 patents accessible as PDF files, from the Civil War to the dawn of the modern computer age.

The patents are organized in 2 CD-ROM volumes as follows:

Volume 1:

Ciphony (speech scrambler) Patents (454):

- Digital or pulse

- Frequency Domain

- Time Domain

- Masking

- Voice changing

Miscellaneous or combined methods (9)

Digital Code Devices (42)

Key patents (23)

Mechanical code devices (89):

- With code wheels (as opposed to electric rotors)

- Without code wheels

Miscellaneous Cryptography Patents (96)

Volume 2:

Electromechanical Code Devices (142):

- Rotor & rotor machine patents

- Without rotors

- Electromechanical devices for encoding graphic images (FAX)

- Miscellaneous or combined methods

All files are searchable by date, title, author & patent class as well as by US Government (USG) interest & Army code name. All PDFs can be printed. Required is a free PDF reader such as Foxit (http://www.foxitsoftware.com/pdf/rd_intro.php) or Adobe Acrobat Reader and a PC-type computer with a CD drive.

Primary focus in this collection is communications cryptography. Not included are patents relating to cryptography applied to video, subscriber systems,  gaming, etc., or are patents involving computerized modern systems.

Also included is a guide to US Patent Office searching by patent class.

Searching for these patents online with the USPTO can be a very time-consuming process!

Own this incredible resource on the development of cryptography from its early beginnings to the birth of modern computerized systems!