US3123485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colored optical elements
Assignee: —
•
Filing: —
•
Granted: 1964-03-03
•
Expires: 1981-03-03
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:36
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/28
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
131 words
A NACREOUS COMPOSITION FOR PRODUCING COLOR BY LIGHTINTERFERENCE PHENOMENA COMPRISING A LIGHT-TRANSMITTING SUPPORTING MEDIUM, SAID MEDIUM HAVING, AS A COLOR-PRODUCING SUBSTANCE THEREIN, LIGHT-TRANSMITTING CRYSTALLINE, NACRE-PRODUCING PLATELETS SELECTED FROM THE GROUP CONSISTING OF BASIC LEAD CARBONATE, BISMUTH OXYCHLORIDE, LEAD HYDROGEN ARSENATE, LEAD HYDROGEN PHOSPHATE AND MERCUROUS FORMATE HAVING UNIFORM THICKNESS AND AN INDEX OF REFRACTION OF AT LEAST 1.70, THE MULTIPLICATION PRODUCT OF THICKNESS EXPRESSED IN MILLIMICRONS, AND INDEX OF REFRACTION BEING IN THE RANGE OF FROM ABOUT 200 TO 2000, THE UNIFORMITY OF THICKNESS OF SAID PLATELETS BEING SUCH THAT AT LEAST ABOUT 80% OF THE TOTAL PLATE AREA DOES NOT DIFFER IN THICKNESS BY MORE THAN $10% OF THE AVERAGE PLATELET THICKNESS SO THAT COLORS ARE PRODUCED BY OPTICAL INTERFERENCE PHENOMENA UPON REFLECTION AND TRANSMISSION OF LIGHT BY SAID PLATELETS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-03-03 | 1967-09-02 | 1968-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-03 | 1971-09-02 | 1972-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-03 | 1975-09-02 | 1976-03-03 | $7700.00 | Window Closed / Lapsed |