Inventor · disambiguated record
Ralph Kingsley Blake, Deceased
Also filed as: BLAKE RALPH K · BLAKE RALPH KINGSLEY
4 granted patents·33 citations·filing 1975–1976
75Inventor score
Files withDU PONT4
Top patents by PatentIndex Score
4 records- 0161US4017314AUse of crown compounds (cyclic polyethers) in litho developers to improve halftone dot quality and gradationDU PONT·Filed 1976·Granted Apr 12, 1977·7 cites·10 claims
- 0254US4047956ALow coating weight silver halide element and processDU PONT·Filed 1975·Granted Sep 13, 1977·15 cites·15 claims
- 0353US4029509APositive process using a low coating weight silver halideDU PONT·Filed 1975·Granted Jun 14, 1977·6 cites·8 claims
- 0447US4211837APhotographic silver halide element with opaque backing layerDU PONT·Filed 1976·Granted Jul 8, 1980·5 cites·9 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →