US PATENT SUBCLASS 968 / 804
.~ By movement or acceleration due to gravity [G04F 1/04]


Current as of: June, 1999
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968 /   HD   HOROLOGY

801  DD  APPARATUS WHICH CAN BE SET AND STARTED TO MEASURE OFF PREDETERMINED OR ADJUSTABLY FIXED TIME INTERVALS WITHOUT DRIVING MECHANISMS, E.G., EGG TIMER, ETC. (electric time and time-program switches H01H 43/00) [G04F 1/00] {3}
804.~ By movement or acceleration due to gravity [G04F 1/04] {2}
805  DD  .~.~> By flowing away of a prefixed quantity of fine granular or liquid materials, e.g., sand-glass, water-clock, etc. [G04F 1/06] {2}
808  DD  .~.~> By a body falling a prefixed distance in air or in a viscous material [G04F 1/08]