Donald Richard Randell
30Patents
10h-index
21Co-inventors
75Inventor score
Filing activity: Nov 28, 1972 → Sep 15, 1997
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4021432A | Piperidine derivatives | Chemistry; Metallurgy | 64 | Expired |
| US4248976A | Flame-resistant polymer compositions | Chemistry; Metallurgy | 59 | Expired |
| US4172858A | Flame-resistant polymer compositions | Chemistry; Metallurgy | 50 | Expired |
| US4046737A | Piperidine derivatives | Chemistry; Metallurgy | 26 | Expired |
| US4049647A | Bis piperidyl carboxylates | Chemistry; Metallurgy | 22 | Expired |
| US3992390A | Esters of piperidinols | Chemistry; Metallurgy | 20 | Expired |
| US4014887A | Substituted piperidin-4-ols | Chemistry; Metallurgy | 20 | Expired |
| US4333841A | Dithiophosphate lubricant additives | Chemistry; Metallurgy | 16 | Expired |
| US4973727A | Method for preparation of metal salts of methyl phosphonic acids | Chemistry; Metallurgy | 12 | Expired |
| US4033928A | Stabilized epoxy resins | Chemistry; Metallurgy | 11 | Expired |
| US4038280A | Hydroxyaryl-tetramethyl-piperidines | Chemistry; Metallurgy | 10 | Expired |
| US5977330A | Crosslinked N-substituted chitosan derivatives | Chemistry; Metallurgy | 9 | Expired |
| US3954779A | 4-(4'-Hydroxycyclohexyl)-2,2,6,6-tetramethyl piperidines | Chemistry; Metallurgy | 9 | Expired |
| US4207224A | Plastics composition | Chemistry; Metallurgy | 9 | Expired |
| US4163731A | Fire resistant functional fluid compositions based on phosphate esters and substituted aromatic compounds | Chemistry; Metallurgy | 8 | Expired |
| US5708152A | N-substituted chitosan derivatives in a process for their preparation | Chemistry; Metallurgy | 7 | Expired |
| US4093680A | Phosphorylated tertiary butylated phenol/phenol ester reaction mixtures | Chemistry; Metallurgy | 7 | Expired |
| US3968123A | (3-Thioxo-1,2-dithiol-4-yl) substituted triaryl phosphates and thiophosphates | Chemistry; Metallurgy | 6 | Expired |
| USRE31342E | Piperidyl carboxylates | General | 6 | Expired |
| US4963631A | Polymers | Chemistry; Metallurgy | 5 | Expired |
| US4110305A | Polymers stabilized by esters of piperidinols | Chemistry; Metallurgy | 4 | Expired |
| US4096209A | Phosphorylated secondary butylated phenol/phenol ester mixtures | Chemistry; Metallurgy | 3 | Expired |
| US3939170A | Dehydro pyridinyl sulfides, sulfoxides and sulfones | Emerging Cross-Sectional Technologies | 3 | Expired |
| US4251493A | Gas purification process | Chemistry; Metallurgy | 3 | Expired |
| US4069189A | Chemical process and products | Chemistry; Metallurgy | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.