Ifay F. Chang

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Chappaqua, NY, US

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Patents Grantslast 30 patents

Information Patent Grant
Light activated light valve with a silicon control element
- Patent number 4,767,192
- Issue date Aug 30, 1988
- International Business Machines Corporation
- Ifay F. Chang
- G02 - OPTICS
Information Patent Grant
Light pen input system having two-threshold light sensing
- Patent number 4,642,459
- Issue date Feb 10, 1987
- International Business Machines Corporation
- Nathan S. Caswell
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Full word coding for information processing
- Patent number 4,500,955
- Issue date Feb 19, 1985
- International Business Machines Corporation
- Ifay F. Chang
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Zinc silicate phosphor particles and method for making them
- Patent number 4,440,831
- Issue date Apr 3, 1984
- International Business Machines Corporation
- James M. Brownlow
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Manganese doped zinc silicate luminescent phosphors with III-V oxid...
- Patent number 4,231,892
- Issue date Nov 4, 1980
- International Business Machines Corporation
- Ifay F. Chang
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...