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...that "patent leather" got its name because the process of applying the polished black finish to leather was once patented?
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| Number | Title | Issue Date |
| D608672 | Motion detector | 01/26/2010 |
| D577623 | Control system for security, communication and home automation | 09/30/2008 |
| 7250605 | Passive infra-red detectors A passive infra-red detector including at least three sub-detectors, each sub-detector being operative to receive infra-red radiation from a corresponding one of at least three sub fields-of-view, each sub field-of-view being exclusively defined by an optical elemen... | 07/31/2007 |
| D547223 | Alarm system | 07/24/2007 |
| D527666 | Device for detecting motion and controlling light and temperature | 09/05/2006 |
| 7081817 | Motion detection apparatus employing millimeter wave detector A system and method for motion detection, useful, for example, in intrusion detection, access control, and energy management, including an incoherent detector, including at least one sensing element, operative to detect receipt of radiation having a wavelength betwe... | 07/25/2006 |
| 6933846 | Displacement sensing system A displacement sensing system including an oscillator circuit having a characteristic frequency which varies as a function of a magnetic field in the vicinity thereof, an element whose position relative to the oscillator circuit is varied by a displacement, the elem... | 08/23/2005 |
| 6768294 | Low cost detection technique This invention discloses circuitry for signal measurement including a signal input, a microprocessor, and an oscillator, the oscillator being operable to generate a pulse signal, the frequency of which is a function of amplitude of a first signal received at the sig... | 07/27/2004 |
| 5515029 | Glass breakage detector A method of detecting glass breakage utilizing the sound produced by an event comprising the steps of sensing the sound and producing an electrical signal characteristic of the sound, producing a plurality of frequency band-limited signals from the sound ... | 05/07/1996 |
