Patents by Inventor Laurence Chen

Laurence Chen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Disposable camera with simplified film advance and indicator
    Patent number: 4268150
    Abstract: An inexpensive, small size, disposable camera is provided. The camera utilizes a preloaded film and includes a film strip indicator which is driven by the shutter mechanism for display at the front of the camera. A novel film advance mechanism is also provided that obtains a uniform and precise alignment of a film frame which coincides with a film numerical designation using conventional film without requiring a sprocket drive.
    Type: Grant
    Filed: January 28, 1980
    Date of Patent: May 19, 1981
    Inventor: Laurence Chen
  • Heat collector for smoke alarm
    Patent number: D283989
    Type: Grant
    Filed: August 9, 1984
    Date of Patent: May 27, 1986
    Inventor: Laurence Chen
  • Ionization chamber for a smoke detector
    Patent number: D284272
    Type: Grant
    Filed: August 9, 1984
    Date of Patent: June 17, 1986
    Inventor: Laurence Chen