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United States Patent No. 5,058,213

Raw sewage drying apparatus

Inventor(s): Kishi; Mitsuhiro (Ashikaga, JP), Sunaoka; Toyohiko (Ashikaga, JP)

Issued on: October 22, 1991
Filed on: November 5, 1990
Application No.: 07/609,378
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This patent is subject to an expiration for failure to pay maintenance fees. See comments below.

Raw sewage drying apparatus


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A raw sewage drying apparatus, such as for a portable toilet. The apparatus has an outer casing with an opening in an upper portion thereof, and an outer cover for covering the opening. An inner casing made of a heat resistent material is housed in the outer casing. The inner casing has an opening in an upper portion thereof, and an inner cover for covering the opening. A heating device heats the inner casing. A rotatable drive shaft unit is provided in the inner casing, and a plurality of blades are fixed to the drive shaft unit for stirring the raw sewage stored in the inner casing. A plurality of heating balls are contained in the inner casing for heating the raw sewage.

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The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. In a portable toilet having a tank defining therein a chamber for collecting raw sewage, and a stool communicating with said tank for supplying raw sewage thereto, the improvement comprising:

a heating device for heating the raw sewage contained within said tank;

a stirring shaft rotatably supported on said tank and projecting into the interior thereof, said stirring shaft having a plurality of stirring blades thereon within the interior of said tank; and

a plurality of heat-transfer balls contained in the interior of said tank.

2. A portable toilet according to claim 1, wherein said stirring shaft projects vertically and centrally of said tank and has an air passage extending axially thereof and terminating in a communication hole which communicates with the interior of said tank, and external conduit means connected to the passage in said stirring shaft and extending exteriorly of said tank.

3. A portable toilet according to claim 2, including an exterior blower system for removing vapor and solid material in the form of dust from the interior of said tank.

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#1|FizzMaster comments:

United States Patent No. 5,058,213 expired on October 22, 1999, due to a failure to pay applicable maintenance fees. See the Official Gazette notice here.

For more information on patent maintenance fees, see 35 U.S.C. 41(b) and 37 C.F.R. 1.362(g).

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