David J. A. Roberts

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Mornington, AU

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Patents Grantslast 30 patents

Information Patent Grant
Screw threaded fastener and fastening system
- Patent number 6,185,896
- Issue date Feb 13, 2001
- W. A. Deutsher Pty. Ltd.
- David James Alexander Roberts
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Fastening screw and method of forming same
- Patent number 6,176,664
- Issue date Jan 23, 2001
- W A Deutsher Pty Ltd
- David James Alexander Roberts
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Self-drilling screw
- Patent number 5,597,357
- Issue date Jan 28, 1997
- W. A. Deutsher Pty. Ltd.
- David J. Roberts
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Self-drilling screw
- Patent number 5,487,633
- Issue date Jan 30, 1996
- W. A. Deutscher Pty. Ltd.
- David J. Roberts
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Screw and method of making same
- Patent number 5,295,774
- Issue date Mar 22, 1994
- W. A. Deutsher Pty. Ltd.
- David Roberts
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Self-drilling screw
- Patent number 4,781,506
- Issue date Nov 1, 1988
- W. A. Deutsher Pty. Ltd.
- David J. A. Roberts
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...