David G. Leppard
77Patents
21h-index
56Co-inventors
91Inventor score
Filing activity: Mar 30, 1977 → Sep 27, 2007
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5089050A | Inks containing a water soluble compound as a stabilizer particularly for ink jet printing | Chemistry; Metallurgy | 64 | Expired |
| US5534559A | Daylight curing compositions containing bisacylphosphine oxide photoinitiators | Chemistry; Metallurgy | 60 | Expired |
| US5509957A | Ink compositions | Chemistry; Metallurgy | 60 | Expired |
| US6020528A | Alkylphenylbisacylphosphine oxides and photoinitiator mixtures | Emerging Cross-Sectional Technologies | 58 | Expired |
| US5261953A | Inks | Chemistry; Metallurgy | 56 | Expired |
| US5399770A | Alkylbisacylphosphine oxides | Emerging Cross-Sectional Technologies | 41 | Expired |
| US5942290A | Molecular complex compounds of acylphosphine oxide and .alpha.-hydroxy ketones as photoinitiators | Physics | 38 | Expired |
| US5767169A | Photopolymerizable compositions comprising alkoxyphenyl-substituted bisacylphosphine oxides | Emerging Cross-Sectional Technologies | 38 | Expired |
| US5574166A | Crystalline form of 2-(2-hydroxy-3-.alpha.-cumyl-5-tert-octylphenyl)-2H-benzotriazole | Physics | 35 | Expired |
| US5300414A | Photographic material containing UV absorber | Emerging Cross-Sectional Technologies | 35 | Expired |
| US5364749A | Photographic material containing UV absorber | Emerging Cross-Sectional Technologies | 35 | Expired |
| US5607987A | 2-(2-hydroxy-3-.alpha. cumyl-5-tert nonyl or dodecyl phenyl)-2H- Benzotriazole UV Absorbers | Physics | 31 | Expired |
| US5965776A | Alkoxyphenyl-substituted bisacylphosphine oxides | Emerging Cross-Sectional Technologies | 29 | Expired |
| US5538840A | Photographic recording material containing a UV absorber | Chemistry; Metallurgy | 28 | Expired |
| US5723512A | Dimeric bisacylphosphines, oxides and sulfides | Chemistry; Metallurgy | 28 | Expired |
| US5563242A | Electro coat/base coat/clear coat finishes stabilized with soluble and thermally stable benzotriazole UV absorbers | Physics | 26 | Expired |
| US5554760A | 2-(2-hydroxy-3-.alpha.-cumyl-5-nonylor 5-dodecylphenyl)-2H-benzotriazole | Physics | 22 | Expired |
| US6284813A | Alkylphenylbisacylphosphine oxides and photoinitiator mixtures | Emerging Cross-Sectional Technologies | 22 | Expired |
| US4973701A | Liquid substituted 2H-benzotriazole mixtures, stabilized compositions and processes for preparing the liquid mixtures | Physics | 21 | Expired |
| US6361925B1 | Photoinitiator mixtures and compositions with alkylphenylbisacylphosphine oxides | Emerging Cross-Sectional Technologies | 21 | Expired |
| US6048660A | Non-volatile phenylglyoxalic esters | Chemistry; Metallurgy | 21 | Expired |
| US5472992A | Photopolymerizable compositions containing an alkylbisacylphosphine oxide | Emerging Cross-Sectional Technologies | 21 | Expired |
| US4452884A | Color-photographic recording material | Emerging Cross-Sectional Technologies | 19 | Expired |
| US4268593A | Recording material for color photography | Physics | 15 | Expired |
| US4996326A | Novel 2-(2-hydroxyphenyl)-benzotriazole derivatives, substituted by branched long chain alkyl groups containing ester moieties | Chemistry; Metallurgy | 13 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.