Patent US3428388A successfully refreshed from Google Patents.
US3428388A
Expired / Lapsed
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Layered structure ultraviolet polarizer
Assignee: AT&T Inc
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Filing: 1965-09-29
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Granted: 1969-02-18
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Expires: 1985-09-29
Abstract
No abstract record available.
Inventors
- 👤 Norman A Kuebler
- 👤 Yoh-Han Pao
- 👤 Melvin B Robin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:24
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/30; G02B5/3025; G02B5/3066
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A LIGHT POLARIZER USEFUL IN THE LIGHT FREQUENCY RANGE OF 6000 A. TO 1000 A. COMPRISING A STRUCTURE HAVING AT LEAST EIGHT ALTERNATE LAYERS OF A DIELECTRIC MATERIAL HAVING A LIGHT TRANSMISSION OVER A PORTION OF THE AFOREMENTIONED LIGHT FREQUENCY RANGE OF AT LEAST 90 PERCENT AND A REFLECTING MATERIAL HAVING A LIGHT TRANSMISSIONOVER THE SAME PORTION OF SAID LIGHT RANGE IN THE RANGE OF AT LEAST TEN TIMES LESS THAN THE TRANSMISSION OF THE DIELECTRICLAYER, EACH OF SAID LAYERS HAVING A THICKNESS OF 5 A. TO 15 A. AND A THICKNESS UNIFORMITY OF $2 A. OVER A DISTANCE OF 10 A., AND MEANS FOR DIRECTING A LIGHT BEAM HAVING A LIGHT FREQUENCY IN THE
Claim 2
Dependent Claim
115 words
A LIGHT POLARIZER USEFUL IN THE LIGHT FREQUENCY RANGE OF 6000 A. TO 1000 A. COMPRISING A STRUCTURE HAVING AT LEAST EIGHT ALTERNATE LAYERS OF A DIELECTRIC MATERIAL HAVING A LIGHT TRANSMISSION OVER A PORTION OF THE AFOREMENTIONED LIGHT FREQUENCY RANGE OF AT LEAST 90 PERCENT AND A REFLECTING MATERIAL HAVING A LIGHT TRANSMISSIONOVER THE SAME PORTION OF SAID LIGHT RANGE IN THE RANGE OF AT LEAST TEN TIMES LESS THAN THE TRANSMISSION OF THE DIELECTRICLAYER, EACH OF SAID LAYERS HAVING A THICKNESS OF 5 A. TO 15 A. AND A THICKNESS UNIFORMITY OF $2 A. OVER A DISTANCE OF 10 A., AND MEANS FOR DIRECTING A LIGHT BEAM HAVING A LIGHT FREQUENCY IN THE
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |