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. 20, 1990
Filed:
Oct. 03, 1988
Rajendra Patel, Richardson, TX (US);
Girish Patel, Plano, TX (US);
Network Access Corporation, Richardson, TX (US);
Abstract
The invention relates to upgrading existing telephone central offices which utilize electromechanical or electronic switching equipment to include the capability of processing calls in the ISDN protocol. In particular, it relates to providing said switching equipment with the capability of controlling the connection, management, and disconnection of telephone circuits using Integrated Services Digital Network (ISDN), a national and international standard set of protocols for providing such circuit control and providing and receiving information via the ISDN protocol for enabling enhanced service in the switching equipment.