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 |
| 5880063 | Method of improving coverage of chromogenic reaction product Coverage of a chromogenic reaction product over a substrate is improved by incorporating a color developer in the substrate and coating the substrate with a color former to form a colored reaction product.... | 03/09/1999 |
| 5849202 | Rotary disc filtration process having means to prevent settlement of solids A process and device for the filtration of solid-liquid mixtures, in particular, solid-liquid suspensions with readily sedimenting substances, uses a filtration device such as a rotary filter optionally operating at an overpressure and in a pressure vesse... | 12/15/1998 |
| 5816282 | Ventilation device with operating magnet A ventilation device has a housing which can be connected with a fluid system to be ventilated. A float is movable in the housing, and controls a valve through an operating device for a ventilation process. The valve opens and closes a ventilation passage... | 10/06/1998 |
| 5802454 | Remotely distributed location and messaging system A network of interconnected, remotely distributed, location and messaging systems. Each of the remotely distributed location and messaging systems can be dynamically configured to use different frequencies that are assigned to the regions. Each of the rem... | 09/01/1998 |
| 5755144 | Low profile bicycle pedal with top and bottom side clamping arrangements A low profile bicycle pedal having a pedal body supported by a pedal shaft to be rotatably about an axis of the pedal shaft and at a least pair of clamping members attached to the pedal body for releasably coupling a cleat of a cyclist's shoe thereto. Pre... | 05/26/1998 |
| 5713582 | Seal retainer A sealing assembly is disclosed for creating a seal between first and second mating members or components. The sealing assembly basically includes a seal retainer with one or more annular seals coupled thereto. The seal retainer including a substantially ... | 02/03/1998 |
| 5707512 | Apparatus for the separation of solid-liquid mixtures The invention relates to a process for the separation, in particular filtration of liquids and solids from solid-liquid mixtures, such as from a mineral, ore, coal or sludge suspensions of contaminated earth. The processing space of the filtration apparat... | 01/13/1998 |
| 5695730 | Process for preparing silicic acid hydrate The present invention provides silicic acid hydrate having a large pore volume and tiny particle diameters, and a process for preparing it. There is disclosed silicic acid hydrate obtained by neutralizing an aqueous solution of sodium silicate with a mine... | 12/09/1997 |
| 5688762 | Method of treating hypertension using animal stomach mucosa extract and endogenous protease-inhibitor peptides A process of inhibiting the renin angiotensinogen angiotensin mechanism and treating hypertension administers a blood pressure lowering amount of a protease inhibitor peptide obtained by the cleavage of pepsinogen to a mammal. Hypertension is also treated... | 11/18/1997 |
| 5687550 | Blow molding sealed container system A blow molding method manufactures a sealed container and fills the container with a substance. The container body is connected to a head or top. A part of the head can be detached for opening of the container. A segment of an extruded tube is mounted in ... | 11/18/1997 |