US3221083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical elements formed of resinous materials and process for making the same
Assignee: American Optical Corp
•
Filing: 1960-08-18
•
Granted: 1965-11-30
•
Expires: 1980-08-18
Abstract
No abstract record available.
Inventors
- 👤 Harry D Crandon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:55
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; B; B29; B29C; B29C35/00; B29C35/02; B29C43/00; B29C43/02; B29C71/00; B29C71/0009; B29D; B29D11/00; B29D11/00009; B29D11/00038; B29D11/00067; B29D11/00125; B29D11/00134; B29C2035/0211; B29C35/08; B29C35/0805; B29C2035/0822; B29K; B29K2069/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
THE METHOD OF FORMING A CONTACT LENS WHICH IS ADAPTED TO BE WORN IN DIRECT CONTACT WITH THE EYE OF A PATIENT AND WHICH IS DIMENSIONALLY AND PHYSICALLY STABLE AND OF HIGH OPTICAL QUALITY COMPRISING FORMING A COMPOSITION OF FROM 40% TO 99% ALLYLDIGLYCOLCARBONATE, 1% TO 60% OF A MONOMER SELECTED FROM THE GROUP CONSISTING OF MALEIC ANHYDRIDE AND GLYCIDYL METHACRYLATE, CURING THE MATERIAL OF SAID COMPOSITION BY SUBJECTING THE SAME TO TEMPERATURES RANGING FROM 44*C. TO 150*C. FOR A TIME CYCLE OF FROM 2 TO 17 HOURS AND AT ONE STAGE OF SAID METHOD FORMING SAID COMPOSITION TO THE DESIRED SHAPE OF SAID LENS WITH FINISHED OPTICAL SURFACES ON THE OPPOSED SIDES THEREOF OF CONTROLLED RELATED CURVATURES AND THERE-
Claim 2
Independent Claim
120 words
THE METHOD OF FORMING A CONTACT LENS WHICH IS ADAPTED TO BE WORN IN DIRECT CONTACT WITH THE EYE OF A PATIENT AND WHICH IS DIMENSIONALLY AND PHYSICALLY STABLE AND OF HIGH OPTICAL QUALITY COMPRISING FORMING A COMPOSITION OF FROM 40% TO 99% ALLYLDIGLYCOLCARBONATE, 1% TO 60% OF A MONOMER SELECTED FROM THE GROUP CONSISTING OF MALEIC ANHYDRIDE AND GLYCIDYL METHACRYLATE, CURING THE MATERIAL OF SAID COMPOSITION BY SUBJECTING THE SAME TO TEMPERATURES RANGING FROM 44*C. TO 150*C. FOR A TIME CYCLE OF FROM 2 TO 17 HOURS AND AT ONE STAGE OF SAID METHOD FORMING SAID COMPOSITION TO THE DESIRED SHAPE OF SAID LENS WITH FINISHED OPTICAL SURFACES ON THE OPPOSED SIDES THEREOF OF CONTROLLED RELATED CURVATURES AND THERE-
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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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |