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Class Information
Number: 239/35
Name: Fluid sprinkling, spraying, and diffusing > Slow diffusers > With empty or refill signal or indicator
Description: Apparatus having a device to make known by visual, audible or other means that the material holder is empty or needs replenishing.

Patents under this class:

Patent Number Title Of Patent Date Issued
8544766 Scent dispenser Oct. 1, 2013
8220782 Humidifier Jul. 17, 2012
7917018 Wearable chemical dispenser Mar. 29, 2011
7892487 Useful life indicators Feb. 22, 2011
7670566 Air treatment devices with use-up indicators Mar. 2, 2010
7621462 Actuated air freshener dispenser Nov. 24, 2009
7600697 Vapor-emitting device with end of use indicator Oct. 13, 2009
7449154 Chemical-containing formed material of type of heating of whole the material, container for holding chemical-containing formed material, device for heating and transpiring chemical and indicat Nov. 11, 2008
7188780 Volatile material expiration indicating system Mar. 13, 2007
7059540 Dual dispenser Jun. 13, 2006
6814300 Refill indicator Nov. 9, 2004
6446880 Replaceable reservoir for an atomizing apparatus Sep. 10, 2002
5947686 Fan blade covers Sep. 7, 1999
5788931 Air freshner for motor vehicles Aug. 4, 1998
5449117 Apparatus and method for controllably dispensing drops of liquid Sep. 12, 1995
5269460 Evaporator device, particularly for volatile active substances such as insecticides, perfumes and the like Dec. 14, 1993
5259555 Wooden air freshener with fragrance loading chamber Nov. 9, 1993
5180107 Dispensing unit of volatilizable substance capable of visible determination of its extent of use Jan. 19, 1993
5163616 Air freshener device with visual signal means Nov. 17, 1992
5069877 Article for diffusing volatile substances, and in particular perfume Dec. 3, 1991
4921636 Time duration indicator systems, and also products containing such indicator systems having a limited duration of use or life May. 1, 1990
4898328 Emanator for volatile liquids Feb. 6, 1990
4830791 Odor control device May. 16, 1989
4824707 Decorative air freshener unit Apr. 25, 1989
4583686 Package for dispensing volatiles Apr. 22, 1986
4534070 Automatic toilet bowl cleaner and depletion signal Aug. 13, 1985
4383951 Forced flow vapor distribution device May. 17, 1983
4293095 Air treating device Oct. 6, 1981
4051628 Apparatus for the improved dispensing of plant nutriments Oct. 4, 1977

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