Resources Contact Us Home
Photographic camera

Image Number 3 for United States Patent #4440481.

A photographic camera of a type utilizing a roll of film comprises a camera back lid, a take-up spool for taking up the film therearound, and a plurality of switches incorporated in the take-up spool. The switches built in the take-up spool are all closed, when the film is turned around the spool, to generate a signal inidcative of the fact that the film has no doubt been secured to the spool. An electric circuit is also provided for disabling the film wind-up so long as the camera back lid has not yet been closed even though the film has already loaded in the camera.

  Recently Added Patents
Method and apparatus for controlling a handover between utra R6 cells and R7 cells
Method, system, and computer program product for tracking and accounting for roaming of mobile devices
Temperature sensor interface for wireless and wired charging
System and method of provisioning confidential information via a mobile device
Low voltage comparator circuits
Inductors occupying space above circuit board components
  Randomly Featured Patents
Removable data cartridge for a computer system
Wide area ablation of myocardial tissue
Single ended simplex dual port memory cell
Magnetic recording medium with a binder resin of a starblock copolymer having at least six arms
Threaded shank drill assembly
Machine for the texturation of textile yarn
Restoration of images with undefined pixel values
Superconductor filter
Laminated film and method for producing the same
Rotisserie box