US3760045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing shaped optical bodies useful as aids to vision
Assignee: Individual
•
Filing: 1970-12-23
•
Granted: 1973-09-18
•
Expires: 1990-12-23
Abstract
Abstract Optical lenses useful for replacing damaged or cataractous eye lenses, contact lenses, and other aids to vision obtained from the lens nucleus substance have a high transparency and their optical characteristics such as curvatures, refractive index, and others, can be varied as required.
Inventors
- 👤 H Thiele
- 👤 W Soehnges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:09
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00009; B29D11/00038; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; Y; Y10; Y10S; Y10S623/00; Y10S623/901; Y10S623/92
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
38 words
The process of claim 1, wherein in step (a) dehydration is carried out in an atmosphere, the humidity of which, during dehydration, is only a fraction lower than the water content of the lens material to be dehydrated.
Claim 2
Dependent Claim
24 words
The process of claim 1, wherein mechanical shaping is effected by compressing the partly dehydrated gel obtained according to step (a) in a mold.
Claim 3
Dependent Claim
36 words
The process of claim 3, wherein the pressure applied to the gel on shaping is between about 20 kg./sq.cm. and about 50 kg./sq.cm. and the temperature during shaping is between about 20* C. and about 80*C.
Claim 4
Dependent Claim
104 words
In a process of producing shaped optical bodies useful as aids to vision, the step which comprises cross-linking a shaped optical body obtained by partly dehydrating the inner nuclear part of lenses of the eyes of warm-blooded animals and humans to a water content between about 10 percent and about 40 percent under conditions avoiding the formation of layers of a lower water content than about 10 percent and of cracks, fissures, wrinkles, striation in the resulting partly dehydrated gel, and mechanically shaping said dehydrated gel to form the desired shaped optical body, said cross-linking increasing the strength properties of the shaped optical body.
References Cited (Backward Citations)
GB918626A
Cited
US3408659A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |