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:
May. 22, 2001
Filed:
Sep. 30, 1996
Claude Le Dantec, St Marc sur Couesnon, FR;
Falk Tannhauser, Rennes, FR;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
In the digital communication systems, devices and methods described, a transmission medium is shared by means of service messages indicating to each digital communication device whether or not that device is authorized to send on the medium once the medium is free after the service message. Certain of these messages are collective authorization-to-send messages indicating to a group of communication devices that each is authorized to send by return. When such a collective message is sent, each receiving device, when attempting to send on the medium, determines whether or not it may send in return, in accordance with a preset rule which preferably involves a random ballot.