US3771858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ophthalmic lens
Assignee: Individual
•
Filing: 1972-01-31
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Granted: 1973-11-13
•
Expires: 1992-01-31
Abstract
Abstract This invention relates to an improved visual aid in the form of an ophthalmic lens comprising a comating pair of aligned lens parts, the part furthest from the eye being of a concave meniscus type lens, made of optical glass such as crown; and the part closest to the eye being of a plano-convex type lens, with the convex surface toward the eye, and made of optical plastic such as allyl diglycol carbonate.
Inventors
- 👤 C Bivens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:35
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/06; B; B29; B29D; B29D11/00; B29D11/00009; B29D11/00028; B29D11/0073
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
31 words
A lens as defined in claim 1, and further wherein the base curvature of said front surface of said front lens part is from 6.20 to 6.50 dioptres of plus curvature.
Claim 2
Dependent Claim
31 words
A lens as defined in claim 2, and further wherein the center thickness of both said front leans part and said rear lens part is from 1.8 mm to 1.9 mm.
Claim 3
Dependent Claim
35 words
A lens as defined in claim 3, and further wherein an annular blank of insulation having a configuration identical to that of said front lens part circular rear edge is secured between saId lens parts.
Claim 4
Dependent Claim
27 words
A lens as defined in claim 4, and further wherein one or more V-shaped clamps embrace and secure the exposed outer edges of said combined lens parts.
References Cited (Backward Citations)
US744982A
Cited
US1952394A
Cited
US2024552A
Cited
US2033101A
Cited
US2078590A
Cited
US2025893A
Cited
US2169404A
Cited
US2174917A
Cited
GB524064A
Cited
US2642776A
Cited
US2868075A
Cited
FR1279252A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |