Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Changing mold size or shape during molding or with shrinkage...
Patent
1990-05-24
1992-05-19
Lowe, James
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Changing mold size or shape during molding or with shrinkage...
264 11, 264 25, 425808, B29D 1100
Patent
active
051146290
ABSTRACT:
Disclosed is a process for casting lenses using male and female mould halves, which comprises placing a polymerizable liquid composition into the female mould half, introducing a male mould into the female mould along a substantially vertical axis until the male mould touches the surface of the liquid composition and then allowing the male mould to fall under its own weight into the female mould half and curing or allowing the polymerizable composition to cure. Also included is apparatus suitable for carrying out the casting process which comprises a substantially horizontal support for the female mould, a holder for releasably holding the male mould, means for moving the holder towards and into the female mould along a substantially vertical path passing through the axes of the moulds and means for detecting contact between the male mould and the surface of the liquid composition and causing said holder to release the male mould. Preferably, the moulds are formed from a thermoplastic material and are maintained under a predetermined closing pressure by spot welding the flanges.
REFERENCES:
patent: 2332674 (1943-10-01), Smith
patent: 3005234 (1961-10-01), Oriani et al.
patent: 3423488 (1969-01-01), Bowser
patent: 3894710 (1975-07-01), Sarofeen
patent: 4113224 (1978-09-01), Clark et al.
patent: 4121896 (1978-10-01), Shepherd
patent: 4402659 (1983-09-01), Greenbaum
patent: 4440699 (1984-04-01), Smid et al.
patent: 4469646 (1984-09-01), Rawlings
patent: 4540532 (1985-09-01), Petcen et al.
patent: 4565348 (1986-01-01), Larsen
patent: 4623496 (1986-11-01), Verhoeven et al.
Morland Albert H.
Warren Timothy J.
CooperVision, Inc.
Lowe James
LandOfFree
Process for casting 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 Process for casting lenses, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for casting lenses will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2416022