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. 21, 1996
Filed:
Jul. 12, 1994
James D Allbery, Jr, Farmington Hills, MI (US);
Peter A Troisi, Westford, MA (US);
Susan J Johnson, Novi, MI (US);
James H Cullen, Bedford, MA (US);
Richard L Butler, Toledo, OH (US);
James P Ferreira, Amherst, NH (US);
Joseph Ellison, Detroit, MI (US);
Stanley R Nunn, Novi, MI (US);
Chiman L Patel, Andover, MA (US);
James E Uban, Wellesley, MA (US);
Dale H Schultz, Midland, MI (US);
The Dow Chemical Company, Midland, MI (US);
Abstract
An intelligent front-end communication system which is interposed between a plurality of actively redundant process control computers and a computer network. The intelligent front end communication system includes at least one front end computer which is coupled to the computer network, and a serial communication interface which is coupled between the actively redundant process control computers and the front end computer. The serial communication interface transmits sequential sets of dynamic data from the actively redundant process control computers to the front end computer. The front end computer includes a plurality of reflective or shadow memory buffers for storing and time aligning corresponding sets of dynamic data which are asynchronously received from the serial communication interface.