James A. Calderwood

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South Australia, AU

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Patents Grantslast 30 patents

Information Patent Grant
Ripper boot including a high tensile tip
- Patent number 8,104,199
- Issue date Jan 31, 2012
- James A Calderwood
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Ripper boot
- Patent number 7,757,778
- Issue date Jul 20, 2010
- James A. Calderwood
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING

Patents Applicationslast 30 patents

Information Patent Application
RIPPER BOOT INCLUDING A MALE CARRIER AND A REPLACEABLE FEMALE TOOTH
- Publication number 20120317848
- Publication date Dec 20, 2012
- James A. Calderwood
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Application
RIPPER BOOT INCLUDING A HIGH TENSILE TIP
- Publication number 20100269379
- Publication date Oct 28, 2010
- James A. Calderwood
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Application
Ripper Boot
- Publication number 20080229627
- Publication date Sep 25, 2008
- James A. Calderwood
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING