Patent US2707899A successfully refreshed from Google Patents.
US2707899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-reflecting glass
Assignee: RCA Corp
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Filing: 1951-08-28
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Granted: 1955-05-10
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Expires: 1971-08-28
Abstract
No abstract record available.
Inventors
- 👤 Frederick H Nicoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:43
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/10; G02B1/11; G02B1/113; G02B1/115
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
93 words
AN ARTICLE COMPOSING A GLASS BODY HAVING A REFRACTIVE INDEX OF ABOUT 1,52, THE MAJOR CONSTITUENTS THEREOF BEING SODA-LIME AND SILICA, AND HAVING A SURFACE LAYER OF SKELETONIZED SILICA HAVING AN OPTICAL THICKNESS OF 1/4$ WITH RESPECT TO A PARTICULAR WAVELENGTH OF LIGHT AND A LAYER OF ESSENTIALLY SOLID SUPERIMPOSED IN SAID SURFACE LAYER, SAID LAST MENTIONED LAYER HAVING AN OPTICAL THICKNESS OF 1/2$ WITH RESPECT TO SAID PARTICULAR WAVELENGTH, SAID SKLETONIZED LAYER HAVING AN INDEX OF REFRACTION OF ABOUT 1.23 AND SAID SOLID LAYER HAVING AN INDEX OF REFRACTION OF ABOUT 1.46.
Claim 2
Dependent Claim
93 words
AN ARTICLE COMPOSING A GLASS BODY HAVING A REFRACTIVE INDEX OF ABOUT 1,52, THE MAJOR CONSTITUENTS THEREOF BEING SODA-LIME AND SILICA, AND HAVING A SURFACE LAYER OF SKELETONIZED SILICA HAVING AN OPTICAL THICKNESS OF 1/4$ WITH RESPECT TO A PARTICULAR WAVELENGTH OF LIGHT AND A LAYER OF ESSENTIALLY SOLID SUPERIMPOSED IN SAID SURFACE LAYER, SAID LAST MENTIONED LAYER HAVING AN OPTICAL THICKNESS OF 1/2$ WITH RESPECT TO SAID PARTICULAR WAVELENGTH, SAID SKLETONIZED LAYER HAVING AN INDEX OF REFRACTION OF ABOUT 1.23 AND SAID SOLID LAYER HAVING AN INDEX OF REFRACTION OF ABOUT 1.46.
Claim 3
Independent Claim
89 words
A METHOD OF PRODUCTING AN OPTICAL ELEMENT HAVING A SURFACE WHICH IS RELATIVELY LOW REFLECTING TO LIGHT OF A PARTICULAR WAVELENGTH, COMPRISING DISSOLVING A NETWORK OF MATERIAL FROM A SURFACE OF A GLASS BODY SUCH THAT A LAYER OF SKLETONIZED SILICA ABOUT 1/4$ IN OPTICAL THICKNESS WITH RESPECT TO SAID PARTICULAR WAVELENGTH REMAINS ON SAID SURFACE AND THEN DEPOSITING ON SAID SKELETONIZED LAYER A LAYER OF ESSENTIALLY SOLID SILICA HAVING AN OPTICAL THICKNESS OF 1/2$ WITH RESPECT TO SAID PARTICULAR WAVELENGTH, SAID DEPOSITING BEING ACCOMPLISHED IN AN AQUEOUS SOLUTION.
Claim 4
Independent Claim
89 words
A METHOD OF PRODUCTING AN OPTICAL ELEMENT HAVING A SURFACE WHICH IS RELATIVELY LOW REFLECTING TO LIGHT OF A PARTICULAR WAVELENGTH, COMPRISING DISSOLVING A NETWORK OF MATERIAL FROM A SURFACE OF A GLASS BODY SUCH THAT A LAYER OF SKLETONIZED SILICA ABOUT 1/4$ IN OPTICAL THICKNESS WITH RESPECT TO SAID PARTICULAR WAVELENGTH REMAINS ON SAID SURFACE AND THEN DEPOSITING ON SAID SKELETONIZED LAYER A LAYER OF ESSENTIALLY SOLID SILICA HAVING AN OPTICAL THICKNESS OF 1/2$ WITH RESPECT TO SAID PARTICULAR WAVELENGTH, SAID DEPOSITING BEING ACCOMPLISHED IN AN AQUEOUS SOLUTION.
References Cited (Backward Citations)
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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) | 1958-05-09 | 1958-11-08 | 1959-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-09 | 1962-11-08 | 1963-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-09 | 1966-11-08 | 1967-05-10 | $7700.00 | Window Closed / Lapsed |