The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 26, 2013
Filed:
Jun. 12, 2007
Kei Tanaka, Kawasaki, JP;
Toshiya Saitoh, Ashigarakami-gun, JP;
Kei Tanaka, Kawasaki, JP;
Toshiya Saitoh, Ashigarakami-gun, JP;
Fuji Xerox Co., Ltd., Tokyo, JP;
Abstract
A communication system performs a communication after establishing a channel from an external host device in an external network to an internal host device in an internal network, where a firewall blocks communications from the external host device in the external network to the internal host device in the internal network while selectively allowing communications from the internal network to the external network. The external host device includes a transmitting unit that transmits channel maintenance data to the internal host device when the channel needs to be maintained, with the channel maintenance data being used for maintaining the channel.