Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Changing mold size or shape during molding or with shrinkage...
Patent
1994-11-22
1997-05-20
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Changing mold size or shape during molding or with shrinkage...
264 27, 264 136, 4251744, 4251748E, 425407, 425808, B29D 1100
Patent
active
056309678
ABSTRACT:
A method for forming a preform mass of thermoplastic material into a lens by compression molding between a pair of molds without the formation of air bubbles or the entrapment of air pockets in the finished lens by preheating the preform mass and molds, and further continuing to apply increased pressure while increasing the temperature or maintaining a predetermined temperature and pressure until the mass has been compressed between the two molds into the shape of a substantially finished lens.
REFERENCES:
patent: 5032160 (1991-07-01), Murata et al.
patent: 5100590 (1992-03-01), Ruhlin
patent: 5188650 (1993-02-01), Nomura
patent: 5368790 (1994-11-01), Greshes
LandOfFree
Method and apparatus for making lenses does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for making lenses, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for making lenses will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1721888