Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Systems and methods for embedding metadata in data packets
Methods for treating prostate conditions
Storing hierarchical table as a markup language file
Whitening agents for cellulosic substrates
Method and system of two-dimensional to stereoscopic conversion
Automatic segmentation of articular cartilage from MRI
Radial graphical user interface
  Randomly Featured Patents
High-temperature superconductor lead
Transparent resource administration using a read-only domain controller
Animate entity's line-of-bearing location device and method linking species-specific non-uniform-electric field pattern of heart's ECG to dielectrophoresis
Apparatus for measuring temperature and a method of producing same
Clear, impact-resistant plastics
Permutation lock
Semiconductor device having trench isolation structure and method of manufacturing the same
Electrical plug connector and receptacle therefor
Optical information recording apparatus, information processing apparatus, optical information recording medium, optical information recording method, and computer-readable storage medium
Hydraulic brake pressure regulator