US3176574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low reflectance coatings for optical elements including graduated high index layer
Assignee: Bell and Howell Co
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Filing: 1960-12-19
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Granted: 1965-04-06
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Expires: 1980-12-19
Abstract
No abstract record available.
Inventors
- 👤 Arthur J Socha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:36
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/10; G02B1/11; G02B1/113; G02B1/115; C; C23; C23C; C23C14/00; C23C14/06; C23C14/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A LOW REFLECTANCE OPTICAL MEMBER, WHICH COMPRISES A SUBSTRATE HAVING A PREDETERMINED INDEX OF REFRACTION SUBSTANTIALLY LESS THAN THAT OF LANTHANUM OXIDE AND GREATER THAN THAT OF MAGNESIUM FLUROIDE, A FIRST LAYER ON THE SUBSTRATE COMPRISING LANTHANUM OXIDE GRADATED FROM LOW TO HIGH IN INDEX OF REFRACTION PROCEEDING OUTWARDLY FROM THE INNERMOST PORTION OF THE INNER LAYER AND HAVING A THICKNESS OF APPROXIMATELY ONE-HALF OF A WAVELENGTH, AND A SECOND LAYER OF MAGNESIUM FLUORIDE OF A THICKNESS OF APPROXIMATELY ONE-QUARTER OF A WAVELENGTH ON THE FIRST LAYER.
Claim 2
Dependent Claim
87 words
A LOW REFLECTANCE OPTICAL MEMBER, WHICH COMPRISES A SUBSTRATE HAVING A PREDETERMINED INDEX OF REFRACTION SUBSTANTIALLY LESS THAN THAT OF LANTHANUM OXIDE AND GREATER THAN THAT OF MAGNESIUM FLUROIDE, A FIRST LAYER ON THE SUBSTRATE COMPRISING LANTHANUM OXIDE GRADATED FROM LOW TO HIGH IN INDEX OF REFRACTION PROCEEDING OUTWARDLY FROM THE INNERMOST PORTION OF THE INNER LAYER AND HAVING A THICKNESS OF APPROXIMATELY ONE-HALF OF A WAVELENGTH, AND A SECOND LAYER OF MAGNESIUM FLUORIDE OF A THICKNESS OF APPROXIMATELY ONE-QUARTER OF A WAVELENGTH ON THE FIRST LAYER.
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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) | 1968-04-05 | 1968-10-05 | 1969-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-05 | 1972-10-05 | 1973-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-05 | 1976-10-05 | 1977-04-06 | $7700.00 | Window Closed / Lapsed |