Patents Assigned to Niagara Envelope Co. Inc.
  • Locking envelope
    Patent number: 4240577
    Abstract: An envelope which is closed and secured without adhesive for repeated use. A tuck, flap extension of the closure flap is infolded and tucked back in between the back panel and a lock flap partially overlying the back panel. The back panel and the lock flap, folded back upon it, are secured to the front panel by overlying end tabs.
    Type: Grant
    Filed: November 29, 1979
    Date of Patent: December 23, 1980
    Assignee: Niagara Envelope Co. Inc.
    Inventor: Richard V. Harrigan