US3147132A
Expired / Lapsed
US
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Method of preparing a multi-layer reflection reducing coating
Assignee: Schott AG
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Filing: 1961-01-16
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Granted: 1964-09-01
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Expires: 1981-01-16
Abstract
No abstract record available.
Inventors
- 👤 Geffcken Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:37
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/0623; D; D06; D06Q; D06Q1/00; G; G02; G02B; G02B1/00; G02B1/10; G02B1/11; G02B1/113; G02B1/115
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
142 words
THE METHOD OF PREPARING A MULTI-LAYER COATING AT LEAST ONE LAYER OF WHICH IS AN OPTICALLY UNIFORM THIN LAYER CONSISTING OF AT LEAST TWO SUBSTANCES HAVING DIFFERENT REFRACTIVE INDICES, WHICH COMPRISES FORMING A MIXTURE OF THORIUM FLORIDE AND ZINC SULFIDE, COMPACTING SAID ADMIXTURE INTO PELLET FORM UNDER VACUUM, HEATING THE PELLETIZED ADMIXTURE TO A TEMPERATURE AT WHICH BOTH SUBSTANCES EVAPORATE, DEPOSITING THE RESULTING VAPORS ON A RECEIVING SURFACE TO FORM THEREON A COATING LAYER OF A MIXTURE OF THORIUM FLUORIDE AND ZINC SULFIDE OF A THICKNESS OF ABOUT 0.24$, SUPERIMPOSING OVER SAID FIRST LAYER A CLOSELY ADHERENT LAYER OF ZINC SULFIDE FREE OF THORIUM FLUORIDE OF A THICKNESS OF ABOUT 0.47$ BY VAPORIZATION, AND SUPERIMPOSING OVER SAID SECOND LAYER A CLOSELY ADHERENT LAYER OF MAGNESIUM FLUORIDE OF A THICKNESS OF 0.25$ BY VAPORIZATION TO PRODUCE A TRIPLE LAYER COATING ON SAID SURFACE.
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) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |