Patent US4251474A successfully refreshed from Google Patents.
US4251474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Annular gasket for moulding lenses for organic material
Assignee: EssilorLuxottica SA
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Filing: 1980-02-21
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Granted: 1981-02-17
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Expires: 2000-02-21
Abstract
Abstract An annular gasket for use in the moulding of ophthalmic or optical lenses of organic material, comprises two axially spaced ridges on its inner periphery arranged to cooperate tightly with two mould shells. At least one of the annular ridges is formed at the end of an elastically deformable annular flange extending around the inner periphery at an angle to the axis of the gasket. The flange projects both from a corresponding transverse face of the gasket and from its internal peripheral face.
Inventors
- 👤 Denis Blandin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:54
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00009; B29D11/0048; B29D11/00528; B29C; B29C33/00; B29C33/0038; B29C43/00; B29C43/32; B29C43/36; B29C43/3607; B29D11/00038; B29D11/00125; B29D11/00192; B29D11/00413; B29L; B29L2031/00; B29L2031/76; B29L2031/7602; H; H10; H10K; H10K50/00; H10K50/10; H10K50/11; H10K50/12; H10K85/00; H10K85/30; H10K85/341; H10K85/346; H10K85/50; Y; Y10; Y10S; Y10S425/00; Y10S425/808
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
103 words
An annular gasket for the moulding of ophthalmic or optical lenses, comprising two spaced transverse faces and an inner peripheral face, two axially spaced annular ridges on its inner peripheral face for cooperating tightly with two mould shells, at least one elastically deformable flange projecting from said inner peripheral face, one of said annular ridges being formed at the end of said annular flange, wherein said annular flange extends at an angle to the axis of the gasket, and said flange projects both from the inner peripheral face of the gasket and from a respective one of the transverse faces of the gasket.
Claim 2
Dependent Claim
103 words
An annular gasket for the moulding of ophthalmic or optical lenses, comprising two spaced transverse faces and an inner peripheral face, two axially spaced annular ridges on its inner peripheral face for cooperating tightly with two mould shells, at least one elastically deformable flange projecting from said inner peripheral face, one of said annular ridges being formed at the end of said annular flange, wherein said annular flange extends at an angle to the axis of the gasket, and said flange projects both from the inner peripheral face of the gasket and from a respective one of the transverse faces of the gasket.
Claim 3
Dependent Claim
25 words
An annular gasket according to claim 1, wherein, in axial section, the annular flange has a triangular profile with an acute angle at its apex.
Claim 4
Dependent Claim
21 words
An annular gasket according to claim 2, wherein the acute angle at the apex of the flange is less than 40°.
Claim 5
Dependent Claim
37 words
An annular gasket according to claim 1, further comprising a second elastically deformable annular flange projecting from said inner peripheral face, the other of said annular ridges being formed at the end of said second annular flange.
Claim 6
Dependent Claim
99 words
A process for employing a gasket according to claim 1, comprising placing a suitable quantity of organic material between two mould shells separated from one another by said annular gasket, the organic material being positioned either after only one of the mould shells has been placed in position or after both of the shells have been placed in position, and then exerting a pressure axially on one of the said mould shells while the other shell is being supported, wherein for developing the said pressure a mobile pin is actuated, the excursion of said pin being kept under control.
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) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |