David J. Spring
23Patents
16h-index
9Co-inventors
74Inventor score
Filing activity: Jul 20, 1973 → May 4, 2016
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4136163A | P-Menthane carboxamides having a physiological cooling effect | Human Necessities | 170 | Expired |
| US4150052A | N-substituted paramenthane carboxamides | Human Necessities | 123 | Expired |
| US4230688A | Acyclic carboxamides having a physiological cooling effect | Human Necessities | 114 | Expired |
| US4032661A | Cyclic sulphoxides and sulphones having a physiological cooling action on the human body | Chemistry; Metallurgy | 90 | Expired |
| US4153679A | Acyclic carboxamides having a physiological cooling effect | Human Necessities | 85 | Expired |
| US4178459A | N-Substituted paramenthane carboxamides | Human Necessities | 73 | Expired |
| US4193936A | N-substituted paramenthane carboxamides | Human Necessities | 54 | Expired |
| US4248859A | Alicyclic amides having a physiological cooling effect | Human Necessities | 52 | Expired |
| US4070496A | Phosphine oxides having a physiological cooling effect | Human Necessities | 49 | Expired |
| US4296255A | Acyclic carboxamides having a physiological cooling effect | Human Necessities | 49 | Expired |
| US4226988A | N-substituted paramenthane carboxamides | Human Necessities | 44 | Expired |
| US4694172A | Detection of fires and explosions | Physics | 38 | Expired |
| US4020153A | Cyclic sulphonamides and sulphinamides having a physiological cooling effect | Human Necessities | 33 | Expired |
| US4060091A | Tobacco and tobacco-containing manufactures containing an ingredient having physiological cooling activity | Human Necessities | 30 | Expired |
| US4190643A | Compositions having a physiological cooling effect | Human Necessities | 20 | Expired |
| US4318900A | Alicyclic amides having a physiological cooling effect | Human Necessities | 18 | Expired |
| US5150577A | System and method for recovering and purifying a halocarbon composition | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4719857A | Pyrotechnic device | Emerging Cross-Sectional Technologies | 11 | Expired |
| US4069345A | Compositions having a physiological cooling effect | Human Necessities | 7 | Expired |
| USD807436S1 | Game board | General | 5 | Active |
| US4722766A | Extinguishing of fires and explosions | Human Necessities | 3 | Expired |
| US4713101A | Cooling apparatus | Mechanical Engineering; Lighting; Heating | 3 | Expired |
| US5464980A | Flame sensors and methods of sensing flame | Physics | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.