Patent US3197296A successfully refreshed from Google Patents.
US3197296A
Expired / Lapsed
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Glass composition and method of producing transparent phototropic body
Assignee: Corning Glass Works
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Filing: 1962-11-14
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Granted: 1965-07-27
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Expires: 1982-11-14
Abstract
No abstract record available.
Inventors
- 👤 Richard A Eppler
- 👤 Stanley D Stookey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:09
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/04; C03C4/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
51 words
A GLASS HAVING A ND BETWEEN 1.52-1.54 CONSISTING ESSENTIALLY ON A WEIGHT PERCENT BASIS OF 48-57% SIO2, 6-10% AL2O3, 15-22% B2O3, 0.8-2.0% NA2O8 2.4-3.1% LI2O, 0-4% K2O, THE TOTAL LI2O+NA2O+K2O BEING 3.27.2%, 4.5-5.3% PBO, 3-9% BAO, 0-7.2% ZRO2, 0.150-6% AG, 0.01-0.02% CUO, 0.3-1.2% CL, 0-1.0% BR, 0-1.0% I, AND 0-1.2% F.
Claim 2
Dependent Claim
51 words
A GLASS HAVING A ND BETWEEN 1.52-1.54 CONSISTING ESSENTIALLY ON A WEIGHT PERCENT BASIS OF 48-57% SIO2, 6-10% AL2O3, 15-22% B2O3, 0.8-2.0% NA2O8 2.4-3.1% LI2O, 0-4% K2O, THE TOTAL LI2O+NA2O+K2O BEING 3.27.2%, 4.5-5.3% PBO, 3-9% BAO, 0-7.2% ZRO2, 0.150-6% AG, 0.01-0.02% CUO, 0.3-1.2% CL, 0-1.0% BR, 0-1.0% I, AND 0-1.2% F.
Claim 3
Independent Claim
153 words
THE METHOD OF PRODUCING A PHOTOTROPIC GLASS BODY ESSENTIALLY TRANSPARENT TO VISIBLE RADIATION BUT WHICH WILL HAVE A TRANSMISSION TO VISIBLE RADIATION OF LESS THAN ABOUT 45% OF ITS ORIGINAL VALUE UPON EXPOSURE TO ACTINIC RADIATION OF A WAVE LENGTH BETWEEN 3000 A. AND 4500 A., A HALFFADING TIME OF LESS THAN 300 SECONDS, AND A ND OF BETWEEN 1.52-1.54, WHICH COMPRISES MELTING A BATCH FOR A GLASS COMPOSITION CONSISTING ESSENTIALLY ON A WEIGHT BASIS OF 4857% SIO2, 6-10% AL2O3, 15-22% B2O3, 0.8-2% NA2O, 2.4-3.1% LI2O, 0-4% K2O, THE TOTAL LI2O+NA2O+K2O BEING 3.2-7.2%, 4.5-5.3% PBO, 3-9% BAO, 0-7.2% ZRO2, 0.15-0.6% AG, 0.01-0.02% CUO, 0.3-1.2% CL, 0-1.0% BR, 0-1.0% I, AND 0-1.2% F, FORMING THE MOLTEN GLASS TO THE DESIRED SHAPE, AND THEREAFTER HEAT TREATING SAID SHAPE BY EXPOSING IT TO A TEMPERATURE RANGE OF ABOUT 500*-750*C. FOR A SUFFICIENT TIME TO CAUSE THE PRECIPITATION OF SUBMICROSCOPIC CRYSTALS OF RADIATION-SENSITIVE MATERIAL WITHIN THE GLASS.
Claim 4
Independent Claim
153 words
THE METHOD OF PRODUCING A PHOTOTROPIC GLASS BODY ESSENTIALLY TRANSPARENT TO VISIBLE RADIATION BUT WHICH WILL HAVE A TRANSMISSION TO VISIBLE RADIATION OF LESS THAN ABOUT 45% OF ITS ORIGINAL VALUE UPON EXPOSURE TO ACTINIC RADIATION OF A WAVE LENGTH BETWEEN 3000 A. AND 4500 A., A HALFFADING TIME OF LESS THAN 300 SECONDS, AND A ND OF BETWEEN 1.52-1.54, WHICH COMPRISES MELTING A BATCH FOR A GLASS COMPOSITION CONSISTING ESSENTIALLY ON A WEIGHT BASIS OF 4857% SIO2, 6-10% AL2O3, 15-22% B2O3, 0.8-2% NA2O, 2.4-3.1% LI2O, 0-4% K2O, THE TOTAL LI2O+NA2O+K2O BEING 3.2-7.2%, 4.5-5.3% PBO, 3-9% BAO, 0-7.2% ZRO2, 0.15-0.6% AG, 0.01-0.02% CUO, 0.3-1.2% CL, 0-1.0% BR, 0-1.0% I, AND 0-1.2% F, FORMING THE MOLTEN GLASS TO THE DESIRED SHAPE, AND THEREAFTER HEAT TREATING SAID SHAPE BY EXPOSING IT TO A TEMPERATURE RANGE OF ABOUT 500*-750*C. FOR A SUFFICIENT TIME TO CAUSE THE PRECIPITATION OF SUBMICROSCOPIC CRYSTALS OF RADIATION-SENSITIVE MATERIAL WITHIN THE GLASS.
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) | 1968-07-26 | 1969-01-25 | 1969-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-26 | 1973-01-25 | 1973-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-26 | 1977-01-25 | 1977-07-27 | $7700.00 | Window Closed / Lapsed |