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 |
| 6773944 | Method of manufacturing a semiconductor device A semiconductor device is provided which is constituted by semiconductor devices including a thin film transistor with a GOLD structure, the GOLD structure thin film transistor being such that: a semiconductor layer, a gate insulating film, and a gate electrode are ... | 08/10/2004 |
| 5981237 | Method for liquefaction of cereal grain starch substrate and apparatus therefor A method and apparatus are disclosed for liquefaction of starch derived from cereal grain. A single-screw extruder is utilized to gelatinize a starch substrate providing significant advantage over prior art jet steam cookers. Liquefaction of the gelatiniz... | 11/09/1999 |
| 5210032 | Degeneration-resistant solventogenic clostridia Butanol and acetone are major end products of a bacterial fermentation process carried out by anaerobic saccharolytic clostridia such as Clostridium acetobutylicum. However, these organisms degenerate upon repeated subculture of growing cells, thereby los... | 05/11/1993 |
| 5141861 | Method of use of a multi-stage reactor-separator with simultaneous product separation A multi-stage reactor-separator for the fermentative production of volatile inhibitory products from non-volatile substrate includes a stirred tank reactor and a packed or tray-type gas-liquid contacting column separator. Each reactor and separator form a... | 08/25/1992 |
| 5063156 | Process for the fermentative production of acetone, butanol and ethanol A process including multistage continuous fermentation followed by batch fermentation with carefully chosen temperatures for each fermentation step, combined with an asporogenic strain of C. acetobutylicum and a high carbohydrate substrate concentration y... | 11/05/1991 |
| 4628116 | Vinyl bromide extraction of butyric acid and butanol from microbial fermentation broth The process of extracting butyric acid and normal butanol from microbial fermentation broth, comprising contacting an aqueous solution of a microbial fermentation broth with vinyl bromide to extract any butyric acid and normal butanol which is present fro... | 12/09/1986 |
| 4521516 | Strain of Clostridium acetobutylicum and process for its preparation A novel asporogenic strain of Clostridium acetobutylicum is produced by growing a spore-forming strain in a continuous culturing reactor. Culturing is conducted at a dilution rate which prevents accumulation of butanol and acetone in the medium. Culturing... | 06/04/1985 |