US4066335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable density lens
Assignee: Xerox Corp
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Filing: 1976-01-19
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Granted: 1978-01-03
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Expires: 1996-01-19
Abstract
Abstract A lens is fabricated with a layer of liquid crystalline material between electrodes, wherein the liquid crystalline composition is capable of altering the state of polarization of light when a voltage is applied between the electrodes. A linear polarizer and an analyzer are used in conjunction with the lens, and optionally are incorporated into the lens.
Inventors
- 👤 John E. Courtney
- 👤 Charles J. Urso
- 👤 Gary A. Dir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:29
CPC Classifications
G; G02; G02B; G02B3/00; G02B3/12; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133526; G02F1/29; G02F2203/00; G02F2203/28
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
63 words
A variable density, split-Dagor lens, comprising a positive crown, a negative flint, a positive meniscus and an electro-optic cell laminated thereto; said electro-optic cell comprising in sandwich configuration a linear polarizer, a layer of conductive material, a liquid crystalline composition capable of altering the state of polarization of light when a voltage is applied thereacross, another layer of conductive material, and an analyzer.
Claim 2
Dependent Claim
63 words
A variable density, split-Dagor lens, comprising a positive crown, a negative flint, a positive meniscus and an electro-optic cell laminated thereto; said electro-optic cell comprising in sandwich configuration a linear polarizer, a layer of conductive material, a liquid crystalline composition capable of altering the state of polarization of light when a voltage is applied thereacross, another layer of conductive material, and an analyzer.
Claim 3
Dependent Claim
19 words
The lens of claim 1 wherein said electro-optic cell is laminated between said positive crown and said negative flint.
Claim 4
Dependent Claim
19 words
The lens of claim 1 wherein said electro-optic cell is laminated on the front surface of said positive crown.
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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) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |