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 |
| 7935603 | Symmetric non-intrusive and covert technique to render a transistor permanently non-operable A technique for and structures for camouflaging an integrated circuit structure. The technique including forming active areas of a first conductivity type and LDD regions of a second conductivity type resulting in a transistor that is always non-operational when sta... | 05/03/2011 |
| 6768458 | Photonically controlled active array radar system An active array radar system is controlled by photonic signals. The array of N antenna elements is divided into M subarrays, each having N/M antenna elements. Tunable lasers provide M optical wavelengths within non-overlapping bands. For transmission, a microwave tr... | 07/27/2004 |
| 6518917 | MPRF interpulse phase modulation for maximizing doppler clear space A method for operating a radar system includes the steps of overlapping mainlobe clutter interference and feedthrough interference in a Doppler output signal of a coherent pulse Doppler radar including the step of phase modulating each pulse of a transmit... | 02/11/2003 |
| 5841395 | Localized interference nulling preprocessor A localized interference nulling preprocessor for a Fast Fourier Transform (FFT) or a Butler matrix system includes a means for forming a dot product of a signal vector and each of the preprocessed eigen vectors of the virtual interference covariance matr... | 11/24/1998 |
| 5739534 | Methods and apparatus for detecting fluids A system for detecting the presence of a fluid comprising: means for transmitting at least two infrared electromagnetic signals toward a fluid, each of the infrared electromagnetic signals have different wavelengths. It also includes means for sensing the... | 04/14/1998 |
| 4176209 | Process for forming polymeric paraxylylene coatings and films possessing improved oxidation resistance Polymeric paraxylylene coatings and films possessing significantly improved oxidation resistance, particularly at elevated temperatures, are disclosed as well as a process for their preparation wherein certain antioxidants are vaporized and codeposited wi... | 11/27/1979 |