David C. Darwin
12Patents
11h-index
22Co-inventors
72Inventor score
Filing activity: Sep 29, 1993 → Apr 3, 2013
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5643978A | Cement admixture product having improved rheological properties and process of forming same | Chemistry; Metallurgy | 127 | Expired |
| US5393343A | Cement and cement composition having improved rheological properties | Chemistry; Metallurgy | 124 | Expired |
| US5633298A | Cement admixture product having improved rheological properties and process of forming same | Chemistry; Metallurgy | 112 | Expired |
| US5665158A | Cement admixture product | Chemistry; Metallurgy | 72 | Expired |
| US5725657A | Cement admixture product | Chemistry; Metallurgy | 70 | Expired |
| US5840114A | High early-strength-enhancing admixture for precast hydraulic cement and compositions containing same | Chemistry; Metallurgy | 61 | Expired |
| US5728207A | Cement admixture product having improved rheological properties and process of forming same | Chemistry; Metallurgy | 54 | Expired |
| US5753744A | Cement and cement composition having improved rheological properties | Chemistry; Metallurgy | 51 | Expired |
| US5583183A | Cement and cement composition having improved rheological properties | Chemistry; Metallurgy | 47 | Expired |
| US6139623A | Emulsified comb polymer and defoaming agent composition and method of making same | Chemistry; Metallurgy | 35 | Expired |
| US7670415B1 | Vapor barrier for porous structures and system | Chemistry; Metallurgy | 14 | Active |
| US9125403B2 | Waterproofing and preservative compositions for organic material | Emerging Cross-Sectional Technologies | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.