Mold and a method of hot-forming a thermoplastic lens

Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C264S002400, C264S002700, C264S296000, C264S327000, C425S407000, C425S808000, C425SDIG001, C425SDIG002

Reexamination Certificate

active

06884369

ABSTRACT:
The mold comprises two dies mounted in a sheath to slide along the axis of the sheath and each presenting a forming face facing the other. The two dies and the sheath are provided with intrinsic heat transfer means.A parison or preform of said thermoplastic material is placed between the two dies and the assembly is enclosed in the sheath; the dies and the sheath are heated by their intrinsic heat transfer means up to a forming temperature;The dies are moved towards each other to shape the material by plastic deformation until a predetermined relative position is reached corresponding to the thickness desired for the lens; the dies and the sheath are cooled by their intrinsic heat transfer means down to an unmolding temperature; and the finished lens is extracted from the mold.

REFERENCES:
patent: 2304664 (1942-12-01), Smith
patent: 4364878 (1982-12-01), Laliberte et al.
patent: 4540534 (1985-09-01), Grendol
patent: 4569807 (1986-02-01), Boudet
patent: 4933119 (1990-06-01), Weymouth, Jr.
patent: 5075051 (1991-12-01), Ito et al.
patent: 5297951 (1994-03-01), Asai
patent: 5376317 (1994-12-01), Maus et al.
patent: 5458820 (1995-10-01), Lefebvre
patent: 6180033 (2001-01-01), Greshes
patent: 2 525 525 (1983-10-01), None
patent: 572748 (1945-10-01), None
patent: 62095210 (1987-05-01), None
patent: 9924243 (1999-05-01), None
patent: 0143953 (2003-06-01), None

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Mold and a method of hot-forming a thermoplastic lens does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Mold and a method of hot-forming a thermoplastic lens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mold and a method of hot-forming a thermoplastic lens will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3431075

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.