Patent US4424175A successfully refreshed from Google Patents.
US4424175A
Expired / Lapsed
US
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Spin casting
Assignee: Sunsoft Corp
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Filing: 1982-07-27
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Granted: 1984-01-03
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Expires: 2002-07-27
Abstract
Abstract A method of using centrifugal force to reduce the effects of surface tension, viscosity and gravity on the shape of the concave surface in the spin casting of contact lenses.
Inventors
- 👤 Charles W. Neefe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:16
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00009; B29D11/00038; B29D11/00115; B29C; B29C39/00; B29C39/02; B29C39/04; B29C39/08; B29C41/00; B29C41/003; B29C41/02; B29C41/04; B29C41/06; B29K; B29K2033/00; B29K2033/04; B29L; B29L2011/00; B29L2011/0016; B29L2011/0041; B29L2031/00; B29L2031/76; Y; Y10; Y10S; Y10S425/00; Y10S425/808
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
65 words
A method of reducing the effect of surface tension on the shape of the concave surface of spin cast contact lenses by revolving a plurality of concave lens molds around a common center, the molds concave optical surface being positioned toward the common center of rotation and revolving each lens mold around the intended lens optical axis and perpendicular to the common axis of rotation.
Claim 2
Independent Claim
65 words
A method of reducing the effect of surface tension on the shape of the concave surface of spin cast contact lenses by revolving a plurality of concave lens molds around a common center, the molds concave optical surface being positioned toward the common center of rotation and revolving each lens mold around the intended lens optical axis and perpendicular to the common axis of rotation.
Claim 3
Independent Claim
64 words
A method of reducing the effect of gravity on the shape of the concave surface of spin cast contact lenses by revolving a plurality of concave lens molds around a common center, the molds concave optical surface being positioned toward the common center of rotation and revolving each lens mold around the intended lens optical axis and perpendicular to the common axis of rotation.
Claim 4
Independent Claim
64 words
A method of reducing the effect of gravity on the shape of the concave surface of spin cast contact lenses by revolving a plurality of concave lens molds around a common center, the molds concave optical surface being positioned toward the common center of rotation and revolving each lens mold around the intended lens optical axis and perpendicular to the common axis of rotation.
Claim 5
Independent Claim
65 words
A method of reducing the effect of fluid viscosity on the shape of the concave surface of spin cast contact lenses by revolving a plurality of concave lens molds around a common center, the molds concave optical surface being positioned toward the common center of rotation and revolving each lens mold around the intended lens optical axis and perpendicular to the common axis of rotation.
Claim 6
Independent Claim
65 words
A method of reducing the effect of fluid viscosity on the shape of the concave surface of spin cast contact lenses by revolving a plurality of concave lens molds around a common center, the molds concave optical surface being positioned toward the common center of rotation and revolving each lens mold around the intended lens optical axis and perpendicular to the common axis of rotation.
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) | 1987-01-02 | 1987-07-04 | 1988-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-02 | 1991-07-04 | 1992-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-02 | 1995-07-04 | 1996-01-03 | $7700.00 | Window Closed / Lapsed |