US3176575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low reflectance optical member coatings with barrier 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
2026-10-23 19:31
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/10; G02B1/11; G02B1/113; G02B1/115; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/261
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
111 words
A LOW REFLECTANCE OPTICAL MEMBER, WHICH COMPRISES A SUBSTRATE OF EXTRA DENSE FLINT GLASS HAVING A PREDETERMINED INDEX OF REFRACTION, A BARRIER LAYER OF ESSENTIALLY PURE SILICON DIOXIDE ON THE SUBSTRATE OF A THICKNESS BETWEEN ONE THIRTY-SECOND AND ONE-SIXTEENTH OF A WAVELENGTH OF LIGHT, A FIRST COATING ON TE SUBSTRATE HAVING AN INDEX OF REFRACTION SUBSTANTIALLY GREATER THAN THAT OF THE SUBSTRATE AND BEING APPROXIMATELY ONE-HALF OF A WAVELENGTH OF LIGHT IN THICKNESS, AND A SECOND COATING ON THE FIRST COATING AND OF A MATERIAL OF AN INDEX OF REFRACTION SUBSTANTIALLY LESS THAN THAT OF THE FIRST COATING AND BEING OF A THICKNESS OF APPROXIMATELY ONE-QUARTER OF A WAVELENGTH OF LIGHT.
References Cited (Backward Citations)
US2366516A
Cited
US2397929A
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US2474061A
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US2445238A
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US2478385A
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FR1034960A
Cited
US2834689A
Cited
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 |