Timing device
OwnerGerhart Weissinventor
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Abstract
A timing device comprises a container of a transparent material, a channel in said container, and a flotation liquid and a float in said channel, said float having a density different from that of said flotation liquid. Flotation liquid compositions are disclosed which provide a transit time of said float through said channel which is essentially independent of temperature over the normal ambient room temperature range. A number of the embodiments provide for adjustment of the transit times over a substantial range of times.
Claims32
A timer, comprising a container having an elongated channel therein, said channel having two closed ends and an axis, a float in said channel, said float being sized to move with clearance from one end of said channel to the other, and a flotation liquid essentially filling said channel with said float therein, said flotation liquid comprising a polydimethylsiloxane oil, having a viscosity between about 5 and 25 centistokes (cs) at room temperature, a mineral oil and a sufficient quantity of a halocarbon having a density of at least 1.5 to yield a selected transit time of said float from one end of said channel to the other when the axis of said channel is in a selected non-horizontal orientation, the relative quantities of said siloxane oil and said mineral oil being such that said transit time is substantially independent of temperature.
Dependencies are inferred from the claim text.