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:
Jun. 15, 1993
Filed:
Sep. 28, 1990
Applicant:
Inventors:
Morrie Gasser, Saugus, MA (US);
Andrew C Goldstein, Hudson, MA (US);
Charles W Kaufman, Northborough, MA (US);
Assignee:
Digital Equipment Corporation, Maynard, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L / ; H04L / ;
U.S. Cl.
CPC ...
380 23 ; 380-4 ; 380 25 ; 380 30 ; 380 49 ; 34082531 ; 34082534 ;
Abstract
A method for denying a first group access to a system resource wherein a second group is selected such that the first group is a subgroup of the second group. Access is granted only to those members of the second group who do not derive their membership in the second group through their membership in the first group.