04550542 is referenced by 20 patents and cites 19 patents.

A vision unit which can be easily assembled into the opening in a door such as a fire door which is constructed so that it can withstand high temperatures without disintegration. The vision unit is readily assembled into an opening in the door by one person working alone. The vision unit is composed basically of two frame members, two lower support elements and a biasing element which extends between the wall surface at the top of the opening and one of the support arms of the frame. The support arms include sharp edge portions for contacting a transparent panel member. Securing means such as threaded nuts and bolts or screws pass through the door opening and fasten the frame members to the door as well as to the panel member.

Title
Vision panel frame
Application Number
6/639066
Publication Number
4550542
Application Date
August 9, 1984
Publication Date
November 5, 1985
Inventor
Jack La See
308 West Cedar, Abbotsford, 54405
WI, US
Agent
Quarles & Brady
Assignee
Jack La See
WI, US
IPC
E06B 1/04
E06B 3/62
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