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 |
| 7335883 | Imaging apparatus and method A method of imaging a sample, the method comprising: (a) irradiating a sample with a pulse of electromagnetic radiation, said pulse having a plurality of frequencies in the range from 25 GHz to 100 THz; (b) determining a first parameter related to the amplitude of t... | 02/26/2008 |
| 7315175 | Probe apparatus and method for examining a sample A probe for examining a sample (5), the probe including an emitter (1) for emitting radiation, a detector (1) for detecting radiation and a dielectric member (3) configured to direct radiation from the emitter (1) to the sample ( | 01/01/2008 |
| 7244934 | Analysis apparatus and method A method for investigating the macromolecular structure of a molecular sample, the method composing irradiating the sample with radiation having a plurality of frequencies in the range of 25 GHz to 20 THz; detecting radiation reflected from and/or transmitted by sai... | 07/17/2007 |
| 7214940 | Apparatus and method for investigating a sample An apparatus for investigating a sample comprising a source of a beam of radiation, a detector for detecting a beam of radiation reflected by or transmitted through a sample to be imaged, an optical subsystem for manipulating the beam between the source and detector... | 05/08/2007 |
| 7174037 | Imaging apparatus and method An apparatus and method for imaging a sample, the apparatus including a source for irradiating a sample with a beam of substantially continuous electromagnetic radiation having a frequency in the range 25 GHz to 100 THz; means for subdividing an area of the sample w... | 02/06/2007 |
| 6958853 | Magnetically enhanced radiation source A radiation source comprising a frequency conversion member (1) configured to emit a beam of emitted radiation (7) with at least one frequency in the range from 0.1 THz to 100 THz, in response to irradiation with an input beam (3) with a frequen... | 10/25/2005 |
| 6957099 | Method and apparatus for terahertz imaging In an apparatus and method for imaging a sample: a) the sample to be imaged is irradiated with pulsed electro-magnetic radiation with a plurality of frequencies in the range from 50 GHz to 84 THz; b) an area of the sample is subdivided into a two dimensional array o... | 10/18/2005 |
| 6865014 | Apparatus and method for investigating a sample An apparatus for investigating a sample, the apparatus comprising an emitter (1) for irradiating the sample (27) with a beam of emitted electromagnetic radiation; and a detector (49) for detecting the radiation reflected from the sample, wherein... | 03/08/2005 |
| 6828558 | Three dimensional imaging A method and apparatus for imaging a sample, the method comprising the steps of: a) irradiating a sample to be imaged with a beam of pulsed electromagnetic radiation with a plurality of frequencies in the range from 25 GHz to 100 THz; b) detecting radiation which is... | 12/07/2004 |