Inventor · disambiguated record
Keiji Miyajima
Also filed as: KUMAGAI HIROJI · MIYAJIMA KEIJI
3 granted patents·105 citations·filing 1977–1980
75Inventor score
Files withTOPPAN PRINTING CO LTD3
Top patents by PatentIndex Score
3 records- 0189US4325981AMethod of preventing color accurate reproductions using color photocopiers and the likeTOPPAN PRINTING CO LTD·Filed 1980·Granted Apr 20, 1982·37 cites·6 claims
- 0285US4209551AMethod of fabricating a phosphor screen of a color television picture tubeTOPPAN PRINTING CO LTD·Filed 1977·Granted Jun 24, 1980·39 cites·16 claims
- 0377US4277514AForgery resistant document with colored areas and method for thwarting reproduction of sameTOPPAN PRINTING CO LTD·Filed 1979·Granted Jul 7, 1981·29 cites·7 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →