Herbert L. Johns

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Madison, OH, US

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Patents Grantslast 30 patents

Information Patent Grant
Zirconia pen balls
- Patent number 4,621,936
- Issue date Nov 11, 1986
- Corning Glass Works
- John N. Hansson
- B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
Information Patent Grant
Porous zirconia containing ceramics
- Patent number 4,203,772
- Issue date May 20, 1980
- Corning Glass Works
- Allen D. Davis
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information Patent Grant
Tetragonally stabilized zirconia ceramic
- Patent number 4,035,191
- Issue date Jul 12, 1977
- Corning Glass Works
- Herbert L. Johns
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES