Robert M. Johnson
33Patents
13h-index
24Co-inventors
81Inventor score
Filing activity: Jan 7, 1974 → Sep 4, 2020
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4428775A | Reinforced cement sheet product containing no asbestos for fabricating on hatschek machine | Emerging Cross-Sectional Technologies | 107 | Expired |
| US4058112A | Head positioner and arm rest for eye surgery | Human Necessities | 35 | Expired |
| US4455271A | Foamed gypsum wallboard | Fixed Constructions | 34 | Expired |
| US4057443A | Foamed gypsum wallboard | Performing Operations; Transporting | 33 | Expired |
| US4363666A | Reinforced cement sheet product containing fibers other than asbestos, clay and thickener | Emerging Cross-Sectional Technologies | 32 | Expired |
| US4377415A | Reinforced cement sheet product containing wollastonite for reduced shrinkage | Emerging Cross-Sectional Technologies | 28 | Expired |
| US4622494A | Signalling device | Performing Operations; Transporting | 25 | Expired |
| US4543159A | Reinforced cement sheet product containing no asbestos for fabricating on Hatschek machine | Performing Operations; Transporting | 23 | Expired |
| US4465019A | Method for deodorizing animal waste and preparing pet litter | Human Necessities | 16 | Expired |
| USD594399S1 | Air intake stack | General | 16 | Expired |
| US4424763A | Citrus pulp litter for pet animals | Human Necessities | 14 | Expired |
| US4057662A | Block-resistant gypsum board | Emerging Cross-Sectional Technologies | 13 | Expired |
| US7163725B2 | Display tree with bubble trunk | Human Necessities | 13 | Expired |
| US7393667B2 | Stereoselective reduction process for the preparation of pyrrolotriazine compounds | Chemistry; Metallurgy | 13 | Active |
| US4386580A | Animal litter and method for deodorizing animal waste with dried citrus pulp | Human Necessities | 12 | Expired |
| US4867607A | Linkage apparatus having a mechanism for dampening vibrations | Fixed Constructions | 11 | Expired |
| US8311040B2 | Packing source data packets into transporting packets with fragmentation | Electricity | 11 | Active |
| US4411962A | Induced or constrained superplastic laminates for forming | Emerging Cross-Sectional Technologies | 9 | Expired |
| US3985610A | Water-resistant asbestos-cement | Emerging Cross-Sectional Technologies | 7 | Expired |
| US4549327A | Cleaner and chalk dust receptacle for chalk board erasers | Performing Operations; Transporting | 6 | Expired |
| US4193188A | Flexible saw | Performing Operations; Transporting | 6 | Expired |
| US4240203A | Flexible saw | Performing Operations; Transporting | 5 | Expired |
| US4890493A | Automatic tank reading gauge | Physics | 3 | Expired |
| US4344229A | Flexible tree saw | Emerging Cross-Sectional Technologies | 3 | Expired |
| US4192166A | Decorated metal objects drawn from decorated blanks | Performing Operations; Transporting | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.