John Patrick Hagen

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Rochester, MN, US

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Patents Grantslast 30 patents

Information Patent Grant
Lapping plate topography system
- Patent number 6,882,956
- Issue date Apr 19, 2005
- International Business Machines Corporation
- Carl Francis Sermon
- G01 - MEASURING TESTING
Information Patent Grant
Apparatus and method for reclaiming a disk substrate for use in a d...
- Patent number 6,582,279
- Issue date Jun 24, 2003
- Hitachi Global Storage Technologies Netherlands B.V.
- Dennis L. Fox
- B24 - GRINDING POLISHING
Information Patent Grant
Device and method for inspecting a disk for physical defects
- Patent number 6,356,346
- Issue date Mar 12, 2002
- International Business Machines Corporation
- John Patrick Hagen
- G01 - MEASURING TESTING

Patents Applicationslast 30 patents

Information Patent Application
Lapping plate topography system
- Publication number 20040088137
- Publication date May 6, 2004
- International Business Machines Corporation
- Carl Francis Sermon
- G01 - MEASURING TESTING
Information Patent Application
Method of inspecting an edge of a glass disk for anomalies in an ed...
- Publication number 20020154298
- Publication date Oct 24, 2002
- International Business Machines Corporation
- John Patrick Hagen
- G01 - MEASURING TESTING