Table 6.
Summary of issued patents related to bitumen modification with PPA.
| Year | Type | Patent number | Licensing Company |
|---|---|---|---|
| 1973 | Chemically modified bitumen | US3751278 A | Tosco Lion Inc. |
| 2009 | US20090249978A1 | Innophos | |
|
| |||
| 1991 | Polymer-modified bitumen | US5070123 A | Exxon Research & Engineering |
| 1996 | US5565510 A | Montell North America Inc. | |
| 1996 | US5519073 A | Shell Oil Company | |
| 1999 | US5880185 A | Elf Exploration Production | |
| 2000 | US6117926 A | Mathy Construction Company | |
| 2000 | US6031029 A | Ergon | |
| 2000 | US6136898 A | Marathon Ashland Petroleum | |
| 2002 | US6414056 A | Exxon Mobil | |
| 2007 | US20050284333 | ICL Performance Products | |
| 2008 | US7985787 | Innophos | |
|
| |||
| 2010 | Reclaimed asphalt pavement | US8906152 | Innophos |
|
| |||
| 2006 | Roofing membranes | US7678467 B2 | ICL Performance Products |
| 2013 | WO2013116637 A1 | ICL Performance Products | |
|
| |||
| 2004 | Crumb rubber modified bitumen | WO2004081098 A1 | Eurovia |
| 2011 | WO 2011047032 A2 | Innophos | |
| 2011 | WO 2011057085 A2 | Innophos | |
Search criteria. Keywords: (asphalt or bitumen) and (polyphosphoric acid) in title and abstract in Google Patents and Web of Knowledge databases. Accessed in December 2015.