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. 23, 2010
Filed:
Jun. 29, 2005
Minoru Yokoshi, Tokyo, JP;
Mitsuyoshi Yasuda, Tokyo, JP;
Katsutoshi Itoh, Tokyo, JP;
Makoto Natori, Saitama, JP;
Osamu Yoshimura, Kanagawa, JP;
Takeshi Itagaki, Tokyo, JP;
Minoru Yokoshi, Tokyo, JP;
Mitsuyoshi Yasuda, Tokyo, JP;
Katsutoshi Itoh, Tokyo, JP;
Makoto Natori, Saitama, JP;
Osamu Yoshimura, Kanagawa, JP;
Takeshi Itagaki, Tokyo, JP;
Sony Ericsson Mobile Communications Japan, Inc., Tokyo, JP;
Abstract
A communication system including a communication terminal apparatus and a wireless key apparatus in wireless communication is provided. The communication terminal apparatus includes a first communication unit operable to receive a first wireless signal, and a first control unit operable to determine a distance between the communication terminal apparatus and the wireless key apparatus based on the received first wireless signal, wherein the first control unit limits a predetermined function of the communication terminal apparatus based on determining the distance. The wireless key apparatus includes a second communication unit operable to receive a second wireless signal, and a second control unit operable to determine the distance between the communication terminal apparatus and the wireless key apparatus based on the received second wireless signal, whereby the second control unit decreases transmission power associated with the second communication unit based on the determined distance.