Back to results
US 5,160,749 AGranted
Three piece mold assembly for making an ocular device
AssigneeMinnesota Mining and Manufacturing Company
InventorTerence M. Fogarty
Life of this patent
Estimating the term…
Abstract
A mold assembly for making an ocular device such as a contact lens, an intraocular lens or a lens blank has three pieces which include a sleeve, a first mold segment and a second mold segment. The first mold segment includes a peripheral skirt which extends away from a mold cavity and which terminates in an end portion which is in interference fit engagement with the sleeve for establishing a leak-resistant fluid seal.
Claims19
A mold assembly for making an ocular device comprising:
- a sleeve having a passage;
- a first mold segment removably received in said passage;
- and
- a second mold segment removably received in said passage at a location spaced from said first mold segment to present a mold cavity therebetween.
- said first mold segment having a base adjacent said mold cavity and a peripheral skirt extending in a direction away from said mold cavity, said base and said skirt defining an open recess, said sleeve extending along said skirt and being in contact with said skirt for aligning said first mold section with said sleeve, said skirt including an end portion remote from said base, said end portion having a certain cross-sectional area, said passage next to said end portion having a cross-sectional area slightly less than said cross-sectional area of said end portion in order to establish a leak-resistant fluid seal.
2 more elements
A mold assembly for making an ocular device comprising:
- a sleeve having a passage;
- a first mold segment removably received in said passage;
- and
- a second mold segment removably received in said passage at a location spaced from said first mold segment to present a mold cavity therebetween,
- said first mold segment including a peripheral, cylindrical skirt,
- said sleeve including a cylindrical section complementally engageable with said skirt, said sleeve including an inwardly extending flange for limiting movement of said first mold segment in a direction away from said mold cavity, wherein said sleeve includes a frustoconical surface located between said cylindrical section and said flange in order to present an interference fit with a portion of said skirt.
3 more elements
A mold assembly for making an ocular device comprising:
- a sleeve having a passage with a certain central axial length;
- a first mold segment removably received in said passage;
- and
- a second mold segment in engagement with said sleeve, said second mold segment being removably received in said passage at a location spaced from said first mold segment to present a mold cavity therebetween,
- said first mold segment including a peripheral, cylindrical skirt,
- said sleeve including a cylindrical section in complemental, face-to-face engagement with said skirt, said sleeve having an end, said passage including an opening located at said end, said passage along its length from said first mold segment to said opening being larger than said first mold segment and said second mold segment for admitting said first mold segment and said second mold segment into said passage, said sleeve including an inwardly extending flange remote from said end for limiting movement of said first mold segment in a direction away from said mold cavity.
3 more elements
Dependencies are inferred from the claim text.