# US 5,700,689 A · Ventilated composter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,700,689 A - Document ID: US5700689A - Status: Granted - Kind: A - Application number: 08/433,424 - Filed: 1995-04-28 - Granted: 1997-12-23 - Earliest claimed: 1993-09-03 - Inventors: Heinrich Wuster - Web page: https://patentgrep.com/patent/US5700689A ## CPC - C05F 17/907: Small-scale devices without mechanical means for feeding or discharging material, e.g. garden compost bins - Y02P 20/145: the feedstock being materials of biological origin - Y02W 30/40: Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse - C05F: ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS - Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT ## Abstract In an apparatus for making compost, which apparatus comprises a preferably upwardly tapering container (1), which is adapted to be vented at its top and has an upper charging opening (4), which can preferably be closed by a cover (3) and which serves to receive the material to be composted, also a lower discharge opening (7), which can preferably be closed by a flap (6) and which permits the compost to be taken out, a plurality of lower ventilating openings (9), which extend through the container wall (5), and a plurality of air-guiding elements (10), which are provided on the inside surface of the container wall (5) and serve to guide the supply air, which enters through the ventilating openings (9) and flows along the inside surface of the container wall (5). The air guiding elements (10, 12, 13, 15) on the inside surface of the container wall (5) define a flow passage labyrinth, which the air flow along the container wall (5). ## Claims ### Claim 1 A composting device comprising an open-bottomed container having a top end, a bottom end and a side wall extending between the top end and the bottom end, the container having openings to allow venting at the top end, the container comprising (a) a charging opening at the top end for charging material to be composted into the container, (b) a discharge opening at the bottom end for discharging compost from the container, (c) a plurality of venting openings in the side wall at the bottom end, and (d) a plurality of air-guiding scale-like bosses projecting inwardly from an inner surface of the side wall to form a labyrinth of air flow passages defined therebetween for air entering through the venting openings and flowing along the inner side wall surface while the air-guiding bosses forming the labyrinth brake the air flow, (1) the air-guiding bosses being arranged in superposed rows, two adjacent ones of the air-guiding bosses in each row respectively defining therebetween short sections of the labyrinth of air flow passages, and a respective one of the air-guiding bosses in a superposed row being arranged above a respective one of the short sections to form a deflector for the air flowing therethrough. ### Claim 2 (depends on 1) The composting device of claim 1, wherein the side wall is tapered inwardly from the bottom and to the top end. ### Claim 3 (depends on 1) The composting device of claim 1, further comprising a cover arranged over the charging opening. ### Claim 4 (depends on 1) The composting device of claim 1, further comprising a flap arranged over the discharge opening. ### Claim 5 A composting device comprising an open-bottomed container having a top end, a bottom end and a side wall extending between the top end and the bottom end, the container having opening to allow venting at the top end, the container comprising (a) a charging opening at the top end for charging material to be composted into the container, (b) a discharge opening at the bottom end for discharging compost from the container, (c) a plurality of venting openings in the side wall at the bottom end, and (d) a plurality of air-guiding bosses projecting inwardly from an inner surface of the side wall to form a labyrinth of air flow passages defined therebetween for air entering through the venting openings and flowing along the inner side wall surface while the air-guiding bosses forming the labyrinth brake the air flow, (1) the air-guiding bosses being arranged in superposed rows, two adjacent ones of the air-guiding bosses in each row respectively defining therebetween short sections of the labyrinth of air flow passages, and a respective one of the air-guiding bosses in a superposed row being arranged above a respective one of the short sections to form a deflector for the air flowing therethrough, and (2) the air-guiding bosses having laterally projecting edge portions at least partially spanning the air flow passages defined between the bosses. ### Claim 6 (depends on 5) The composting device of claim 5, wherein the side wall is tapered inwardly from the bottom end to the top end. ### Claim 7 (depends on 5) The composting device of claim 5, further comprising a cover arranged over the charging opening. ### Claim 8 (depends on 5) The composting device of claim 5, further comprising a flap arranged over the discharge opening. ### Claim 9 A composting device comprising an open-bottomed container having a top end, a bottom end and a side wall extending between the top end and the bottom end, the container having opening to allow venting at the top end, the container comprising (a) a charging opening at the top end for charging material to be composted into the container, (b) a discharge opening at the bottom end for discharging compost from the container, (c) a plurality of venting openings in the side wall at the bottom end, and (d) a plurality of air-guiding bosses projecting inwardly from an inner surface of the side wall to form a labyrinth of air flow passages defined therebetween for air entering through the venting openings and flowing along the inner side wall surface while the air-guiding bosses forming the labyrinth brake the air flow, (1) the air-guiding bosses being arranged in obliquely extending superposed rows, two adjacent ones of the air-guiding bosses in each row respectively defining therebetween short sections of the labyrinth of air flow passages, and a respective one of the air-guiding bosses in a superposed row being arranged above a respective one of the short sections to form a deflector for the air flowing therethrough. ### Claim 10 (depends on 9) The composting device of claim 9, wherein the side wall is tapered inwardly from the bottom end to the top end. ### Claim 11 (depends on 9) The composting device of claim 9, further comprising a cover arranged over the charging opening. ### Claim 12 (depends on 9) The composting device of claim 9, further comprising a flap arranged over the discharge opening.