US3761208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of contact lenses
Assignee: EssilorLuxottica SA
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Filing: 1971-10-15
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Granted: 1973-09-25
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Expires: 1991-10-15
Abstract
Abstract A contact lens, particularly a flexible, silicone contact lens, is directly moulded with its final profile including a progressively tapered peripheral edge. The lens is moulded by complementary dies and an intermediate annular spacer provided on its inner periphery with a groove of concave cross-section.
Inventors
- 👤 J Boudet
- 👤 G Wajs
- 👤 G Gomond
- 👤 P Billault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:49
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00009; B29D11/00038; B29D11/00057; B29C; B29C43/00; B29C43/32; B29C43/36; B29C43/3607; B29C43/38; Y; Y10; Y10S; Y10S425/00; Y10S425/808
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
126 words
A mould for the production of a contact lens of the kind having a progressively tapered peripheral edge, comprising a concave moulding die, a convex moulding die, and, between these dies, an annular moulding spacer of flexible material provided on its inner periphery with an annular groove of concave crosssection whose inner surface forms a continuation of the surface of the dies, the flexibility of the spacer and the size and shape of the groove being such that upon compression of an excess of moulding material in the mould between the dies, excess material escapes between the spacer and the dies, and upon further compression the sides of the spacer closely fit the dies so that upon demoulding, the lens has no moulding plane visible thereon.
Claim 2
Dependent Claim
126 words
A mould for the production of a contact lens of the kind having a progressively tapered peripheral edge, comprising a concave moulding die, a convex moulding die, and, between these dies, an annular moulding spacer of flexible material provided on its inner periphery with an annular groove of concave crosssection whose inner surface forms a continuation of the surface of the dies, the flexibility of the spacer and the size and shape of the groove being such that upon compression of an excess of moulding material in the mould between the dies, excess material escapes between the spacer and the dies, and upon further compression the sides of the spacer closely fit the dies so that upon demoulding, the lens has no moulding plane visible thereon.
Claim 3
Dependent Claim
17 words
A mould according to claim 1, wherein the annular moulding spacer is constructed separately of the dies.
Claim 4
Dependent Claim
24 words
A mould according to claim 1, wherein the annular moulding spacer is provided, opposite the dies, with plane contact surfaces perpendicular to its axis.
Claim 5
Dependent Claim
28 words
A mould according to claim 2, wherein the annular moulding spacer is carried by a cylindrical skirt enabling it to fit over at least one of the dies.
References Cited (Backward Citations)
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US3005234A
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US3248460A
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US3364525A
Cited
US3422168A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |