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
Semiconductor device and method of manufacturing the same
Enzymatic demethylation of flavonoids
Image capture apparatus and program
Alleviation of laser-induced damage in optical materials by suppression of transient color centers formation and control of phonon population
User interface for integrating applications on a mobile communication device
DL control channel structure enhancement
Interaction analysis and prioritization of mobile content
  Randomly Featured Patents
Meniscal heterografts
Method for autonomic detection and repair of broken links in web environments
Process for preparing solid bis-(4-furfurylidenamino-phenyl)-methane
Pixel array for LC silicon light valve featuring pixels with overlapping edges
Co-extruded cheese snacks
Multi-layer graphical user interface
Celery cultivar ADS-18
Electrical connector position assurance system
Statistical approach to large-scale image annotation
Method for the manufacture and/or filling of a two-chamber pressure pack