Exhaust, Dust Or Smoke Patents (Class 356/438)
Contained (Class 356/439)
  • Wireless multi-head smoke detector system
    Patent number: 4160246
    Abstract: A wireless smoke detector apparatus including at least one detector/transmitter unit and a receiver/annunciator unit. The detector/transmitter having a pulsed infrared radiation source, a photodetector having an optical axis angularly intersecting the axis of the radiation source for detecting radiation scattered by smoke particles and a transmitter responsive to the output of the detector for transmitting a unique receiver/annunciator actuating signal which is distinguishable by the receiver/annunciator from other actuating signals.
    Type: Grant
    Filed: October 3, 1977
    Date of Patent: July 3, 1979
    Assignee: Fairchild Camera and Instrument Corp.
    Inventors: Stephen M. Martin, Ralph P. Miller
  • Optical fire-detector
    Patent number: 4156816
    Abstract: The invention relates to an optical fire-detector in which a radiation-emitting means is arranged to emit a beam of radiation and which has modulator means for the modulation of the beam of radiation in a phase-inverted relationship within a first and a second wavelength band, and a radiation-detecting means is arranged to receive the beam of radiation after it has passed through an intermediate air medium and includes first means for an individual measurement of intensity in the two wavelength bands and second means for the detection of such variations in the measured intensities which are representative for a fire.
    Type: Grant
    Filed: August 4, 1977
    Date of Patent: May 29, 1979
    Assignee: Telefonaktiebolaget L M Ericsson
    Inventor: Erik G. Lindgren
  • Smoke-measuring transducer
    Patent number: 4155653
    Abstract: A smoke transducer having an integral photo-electric optical system and h isolated circuitry. A calibration wedge is designed to permit field calibration and to structurally interfit within the sampling chamber.
    Type: Grant
    Filed: October 14, 1977
    Date of Patent: May 22, 1979
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Anthony San Miguel, James L. Rieger
  • Strobed smoke detector
    Patent number: 4126790
    Abstract: A pulsed or strobed smoke detector operable periodically in a pulsed mode. A strobe generator having minimum power consumption limits the time of power consumption by other elements of the detector to a fraction of continuously operating time. A storage circuit is also included to limit transient or start-up consumption of power.
    Type: Grant
    Filed: September 20, 1976
    Date of Patent: November 21, 1978
    Inventor: Elias E. Solomon
  • Device for the non-dispersive optical determination of the concentration of gas and smoke components
    Patent number: 4126396
    Abstract: A method and apparatus for non-dispersive optical determination of gas and smoke components in a mixture by reflection and detection of radiation, of a different wavelength for each component, through the mixture, wherein the radiation is periodically intercepted before it enters the mixture and reflected direct to the photo-receiver and the measurement signals are divided by the stored direct signals.
    Type: Grant
    Filed: May 11, 1976
    Date of Patent: November 21, 1978
    Assignee: Erwin Sick Gesellschaft mit Beschrankter Haftung, Optik-Elektronic
    Inventors: Klaus Hartmann, Meinhard VON Braitenberg