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Tumbleweed's patent portfolio includes 28 U.S. utility patents and multiple pending U.S. patent applications. The patent portfolio broadly covers methods of secure communication over Internet standards.
The first of these patents was granted on August 4, 1998; and the most recent on April 8, 2008. Tumbleweed owns the full rights to these patents.
- U.S. Patent No. 5,790,790: Electronic document delivery system in which notification of said electronic document is sent to a recipient thereof
- U.S. Patent No. 5,903,651: Apparatus and method for demonstrating and confirming the status of a digital certificates and other data
- U.S. Patent No. 6,061,448: Method and system for dynamic server document encryption
- U.S. Patent No. 6,119,137: Distributed dynamic document conversion server
- U.S. Patent No. 6,151,675: Method and apparatus for effecting secure document format conversion
- U.S. Patent No. 6,192,407: Private, trackable URLs for directed document delivery
- U.S. Patent No. 6,385,655: Method and apparatus for delivering documents over an electronic network
- U.S. Patent No. 6,393,568: Encryption and decryption system and method with content analysis provision
- U.S. Patent No. 6,442,689: Apparatus and method for demonstrating and confirming the status of a digital certificates and other data
- U.S. Patent No. 6,470,086: Method and apparatus for effecting secure document format conversion
- U.S. Patent No. 6,487,599: Electronic document delivery system in which notification of said electronic document is sent to a recipient thereof
- U.S. Patent No. 6,502,191: Method and system for binary data firewall delivery
- U.S. Patent No. 6,516,411: Method and apparatus for effecting secure document format conversion
- U.S. Patent No. 6,529,956: Private, trackable URLs for directed document delivery
- U.S. Patent No. 6,532,540: Apparatus and method for demonstrating and confirming the status of a digital certificates and other data
- U.S. Patent No. 6,609,196: E-mail firewall with stored key encryption/decryption
- U.S. Patent No. 6,651,166: Sender driven certification enrollment system
- U.S. Patent No. 6,725,381: Solicited authentication of a specific user
- U.S. Patent No. 6,748,529: Method and apparatus for effecting secure document format conversion
- U.S. Patent No. 6,826,609: Policy enforcement in a secure data file delivery system
- U.S. Patent No. 6,901,509: Apparatus and method for demonstrating and confirming the status of a digital certificates and other data
- U.S. Patent No. 6,912,285: Mechanism for efficient private bulk messaging
- U.S. Patent No. 7,073,056: Apparatus and method for demonstrating and confirming the status of a digital certificates and other data
- U.S. Patent No. 7,117,358: Method and System for filtering communication
- U.S. Patent No. 7,127,741: Method and System for e-mail message transmission
- U.S. Patent No. 7,162,738: E-mail Firewall with Stored key Encryption/Decryption
- U.S. Patent No. 7,257,564: Dynamic Message Filtering
- U.S. Patent No. 7,356,834: Solicited Authentication of a Specific User
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