William F. Semple, a dentist, was awarded the first US Patent on chewing gum in 1869. His recipe contained powdered chalk.
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| Number | Title | Issue Date |
| 8057670 | Biological fluid filtration system and biological filter used therein A biological fluid processing or fluid filtration system is provided having novel open and closed loop processing systems wherein the gases transferred into and out of the system during processing pass through a porous medium in upstream and/or downstream gas inlet ... | 11/15/2011 |
| 7943044 | Biological fluid filtration system and biological fluid filter used therein A biological fluid processing or fluid filtration system is provided having novel open and closed loop processing systems wherein the gases transferred into and out of the system during processing pass through a porous medium in upstream and/or downstream gas inlet ... | 05/17/2011 |
| 7678272 | Biological fluid filtration system and biological fluid filter used therein A biological fluid processing or fluid filtration system is provided having novel open and closed loop processing systems wherein the gases transferred into and out of the system during processing pass through a porous medium in upstream and/or downstream gas inlet ... | 03/16/2010 |
| 7658847 | Biological fluid filtration apparatus Apparatus for use in a biological fluid processing or fluid filtration system is provided. The biological fluid processing or fluid filtration system has novel open and closed loop processing systems wherein the gases transferred into and out of the system during pr... | 02/09/2010 |
| 7501059 | Biological fluid filtration method and apparatus A biological fluid processing or fluid filtration system is provided having novel open and closed loop processing systems wherein the gases transferred into and out of the system during processing pass through a porous medium in upstream and/or downstream gas inlet ... | 03/10/2009 |
| 6802425 | Biological fluid filtration method and apparatus A biological fluid filter is disclosed for use in a biological fluid processing system. The biological fluid filter comprises an inlet section, with said inlet section comprising a top wall and a downstanding peripheral side wall, an outlet section complimentary in ... | 10/12/2004 |
| 6427847 | Biological fluid filter A biological fluid processing or fluid filtration system is provided having novel open and closed loop processing systems wherein the gases transferred into and out of the system during processing pass through a porous medium in upstream and/or downstream... | 08/06/2002 |
| 6171493 | Biological fluid filtration apparatus A biological fluid processing or fluid filtration system is provided having novel open and closed loop processing systems wherein the gases transferred into and out of the system during processing pass through a porous medium in upstream and/or downstream... | 01/09/2001 |