Patents Assigned to Elm Window Co.
  • High security tamper-proof mailbox
    Patent number: 4290548
    Abstract: A high security mailbox for multiple family dwellings is provided with sliding doors opening to individual compartments. The doors slide in a channel between a one piece face plate and retaining means which are welded to the mailbox housing.
    Type: Grant
    Filed: March 13, 1980
    Date of Patent: September 22, 1981
    Assignee: Elm Window Co.
    Inventor: Norbert J. Denhart