Title:
Upwardly acting door having a torsion spring counterbalance
Document Type and Number:
United States Patent 3038535

Inventors:
Stroup, Earl L.
Crosswell, Flay D.
Schacht, Clifford A.
Publication Date:
06/12/1962
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Assignee:
OVERHEAD DOOR CORP
Primary Class:
160/191
Other Classes:
16/401
US Patent References:
2194111Counterbalance for vertically sliding doors
2226017Closure
2660753Counterbalance for vertically sliding doors


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