US3704558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lens block
Assignee: Coburn Manufacturing Co Inc
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Filing: 1971-02-24
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Granted: 1972-12-05
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Expires: 1991-02-24
Abstract
Abstract A lens block for plastic lens having a circumferential lens blank supporting ledge which is provided with a pair of diametrically opposed vents or grooves. One of the grooves is of a size to permit the egress of air but not of the blocking material.
Inventors
- 👤 George M J Sarofeen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:17
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/005
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
161 words
A lens block for use in lens blank processing apparatus wherein said lens block is angularly disposed comprising front and rear sides, a concave surface on said front side and means on said rear side for mounting said block on lens blank processing apparatus, a lens supporting ledge circumscribing said concave surface for supporting a lens blank in spaced relationship to said concave surface to define a blocking material receiving cavity, conduit meanS communicating said front and rear sides and providing an inlet for blocking material to said cavity, a first passageway in said ledge leading from said chamber to the exterior of said block, and a second passageway of smaller crosssectional dimensions than said first passageway in said ledge diametrically opposite said first passageway and leading from said chamber to the exterior of said block, said block when mounted on said apparatus is angularly positioned to define upper and lower portions with said second passageway being in said lower portion.
Claim 2
Dependent Claim
161 words
A lens block for use in lens blank processing apparatus wherein said lens block is angularly disposed comprising front and rear sides, a concave surface on said front side and means on said rear side for mounting said block on lens blank processing apparatus, a lens supporting ledge circumscribing said concave surface for supporting a lens blank in spaced relationship to said concave surface to define a blocking material receiving cavity, conduit meanS communicating said front and rear sides and providing an inlet for blocking material to said cavity, a first passageway in said ledge leading from said chamber to the exterior of said block, and a second passageway of smaller crosssectional dimensions than said first passageway in said ledge diametrically opposite said first passageway and leading from said chamber to the exterior of said block, said block when mounted on said apparatus is angularly positioned to define upper and lower portions with said second passageway being in said lower portion.
Claim 3
Dependent Claim
44 words
The lens block of claim 1 wherein said second passageway is of a size sufficient to permit the passage of air therethrough, but not the blocking material, and said first passageway is of a cross-sectional size sufficient for the passage of said blocking material.
Claim 4
Dependent Claim
24 words
The lens block of claim 1 wherein said ledge is sloped radially inwardly and said lens blank and said surface is of constant dimensions.
Claim 5
Dependent Claim
21 words
The block of claim 1 wherein said conduit means extends axially of said block and is disposed adjacent the center thereof.
Claim 6
Dependent Claim
12 words
The block of claim 1 wherein said cavity is of uniform thickness.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |