Elapsed time indicator

Horology: time measuring systems or devices – Time interval – Gravity actuated type

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368 95, G04F 108

Patent

active

054576652

ABSTRACT:
An elapsed time indicator can easily indicate time periods of over a month, and is extremely versatile, for example being utilizable in a cap of a water bottle. The indicator includes a substantially transparent and substantially straight tube having first and second ends, an interior and an exterior, with a viscous liquid substantially filling the interior of the tube. A visible indicator, such as a polypropylene spherical bead, a magnetite/wax bead, or a fluid immiscible in the viscous liquid, is immersed in the viscous liquid and dimensioned and positioned with respect to the tube so that it can travel from the first to the second end in a known predetermined period of time when the tube is generally vertical. The time it takes for travel may be precisely calculated. The indicator may be held in a stationary position at one end of the tube, e.g. by clamping a flexible tube end, or using a magnet, prior to initial use. A scale may indicate the relative position of the indicator, and more than one indicator in the same tube, or different in-line and adjacent tubes with different indicators, can be provided.

REFERENCES:
patent: 3025665 (1962-03-01), Dock et al.
patent: 3465516 (1969-09-01), Von Meter
patent: 3553959 (1971-01-01), Young et al.
patent: 3774407 (1973-11-01), Bright
patent: 3938315 (1976-02-01), Von Klemenczkt
patent: 4054026 (1977-10-01), Goodrich
patent: 4090356 (1978-05-01), Arnold
patent: 4228649 (1980-10-01), Weiss
patent: 4419016 (1983-12-01), Zoltan
patent: 4998228 (1991-03-01), Eger et al.

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