Hydraulically-driven concrete finishing trowel having hydraulic fluid cooling system and method

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United States of America Patent

PATENT NO 9631378
SERIAL NO

15019493

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Abstract

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A hydrostatically power self-propelled concrete finishing trowel has at least two coolers in a cooling system of the machine's hydraulic circuit. In the most typical case in which the first cooler is a closed loop oil cooler, the second cooler may take the form of an open loop oil cooler disposed in a flow path connecting one or more low-pressure outlets of the hydrostatic drive system to a reservoir. The closed loop oil cooler actively drops the temperature within the trowel's hydrostatic drive system, while the open loop oil cooler supplements that cooling by reducing the oil temperature in the reservoir.

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Patent Owner(s)

Patent OwnerAddress
HUSQVARNA AB561 82 HUSKVARNA

International Classification(s)

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  • 2016 Application Filing Year
  • E01C Class
  • 410 Applications Filed
  • 310 Patents Issued To-Date
  • 75.61 % Issued To-Date
Click to zoom InYear of Issuance% of Matters IssuedCumulative IssuancesYearly Issuances2016201720182019202020212022202320240255075100

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Grahl, Scott Campbellsport, US 8 33
Jenkins, Michael Menomonee Falls, US 30 77

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Patent Citation Ranking

  • 8 Citation Count
  • E01C Class
  • 19.88 % this patent is cited more than
  • 8 Age
Citation count rangeNumber of patents cited in rangeNumber of patents cited in various citation count ranges341267111101 - 1011 - 2021 - 3031 - 4041 - 5061 - 700102030405060708090100110120130140

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