US PATENT SUBCLASS 402 / 53
.~.~.~ Screw threaded

Current as of: June, 1999
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402 /   HD   BINDER DEVICE RELEASABLY ENGAGING APERTURE OR NOTCH OF SHEET

46  DF  OPPOSED SHEET RETAINERS INVOLVING RELATIVE RECTILINEAR TRAVEL {4}
48  DF  .~ Telescopic retainers with means to telescopically drive and/or secure {4}
52  DF  .~.~ Notched or grooved means {1}
53.~.~.~ Screw threaded

DEFINITION

Classification: 402/53

(under subclass 52) Device wherein the recess is in the form of a continuous helical groove.

SEE OR SEARCH THIS CLASS, SUBCLASS:

51, for a similar device wherein the screw threaded driving or securing means is disposed remote from the retainers.