Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Three-dimensional optical levelling, plumbing and angle-calibrating instrument










Image Number 4 for United States Patent #5539990.

An optical levelling, plumbing and angle-calibrating instrument includes: a frame; a plumb body universally pendulously mounted on the frame and defining a vertical plumb line gravitationally; at least an illuminator electrically connected to a power supply and mounted on the plumb body for emitting laser light; and at least a cylindrical-surfaced lens mounted on the plumb body in front of the illuminator for planarly diverging the laser light as emitted from the illuminator through the lens to form a laser light plane transverse to a lens axis of the cylindrical-surfaced lens, whereby the laser light plane will projectively intersect an objective wall to form a straight line of optical image, serving as a reference line for levelling or plumbing use.








 
 
  Recently Added Patents
Method and apparatus for image sensor packaging
Nonvolatile semiconductor memory device and method for manufacturing the same
Methods, systems, and media for swapping faces in images
Generating and modifying textual code interfaces from graphical programs
Apparatus and methods for providing efficient space-time structures for preambles, pilots and data for multi-input, multi-output communications systems
Methods and systems for optimizing data accesses
Spin transition material
  Randomly Featured Patents
Multi-mode radio telephone which executes handover between different system
Method and arrangement for exchanging data with a hearing device
Steep absorption edge filter glass
Method for notch filtering a digital signal, and corresponding electronic device
Online story collaboration
Method of making a slot via filled dual damascene structure with middle stop layer
Magnetic head with dual spin valve element for differential operation
Genomic plant sequences and uses thereof
Adjustable taper ring collar
Power transfer apparatus