US PATENT SUBCLASS 49 / 89.1
.~.~ Operating system includes biasing means

Current as of: June, 1999
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49 /   HD   MOVABLE OR REMOVABLE CLOSURES

73.1  DF  CLOSURES INTERCONNECTED FOR CONCURRENT MOVEMENT {9}
74.1  DF  .~ Louver-type closures (e.g., slats or panels) {11}
89.1.~.~ Operating system includes biasing means

DEFINITION

Classification: 49/89.1

Operating system includes biasing means:

(under subclass 74.1) Closures provided with a means to urge the panels in a desired direction or to a desired position; e.g., a spring or weight.

SEE OR SEARCH THIS CLASS, SUBCLASS:

21+, for a louver closure biased to a desired position, and having means responsive to the presence of a fluid to move the closure against the action of the biasing means.

386+, for a biasing means for a swinging closure.