Patents Assigned to Pentagon Industries Ltd.
  • Security window unit
    Patent number: 4077167
    Abstract: This specification discloses a secure yet aesthetic window unit which has particular applicability to detention buildings such as prisons, jails, cell blocks, penitentiaries, asylums and similar building structures and which is, for all practical purposes, resistant to metal cutting devices.
    Type: Grant
    Filed: November 23, 1976
    Date of Patent: March 7, 1978
    Assignee: Pentagon Industries Ltd.
    Inventor: Klaus Rieder