US3269847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phototropic glass and methods
Assignee: PPG Industries Inc
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Filing: 1962-07-03
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Granted: 1966-08-30
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Expires: 1982-07-03
Abstract
No abstract record available.
Inventors
- 👤 Alvin J Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:00
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/04; C03C4/06; C03C4/065; G; G01; G01T; G01T1/00; G01T1/02; G01T1/06; H; H01; H01S; H01S3/00; H01S3/10; H01S3/11; H01S3/1123; H01S3/113; Y; Y10; Y10S; Y10S204/00; Y10S204/901; Y10S501/00; Y10S501/90
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
81 words
A STRONGLY REDUCED PHOTOTROPIC GLASS COMPOSITION CONSISTING ESSENTIALLY OF A GLASS BASE COMPOSITION SELECTED FROM THE GROUP CONSISTING OF SODA-SILICA AND SODA-LIMESILICA GLASS COMPOSITIONS OF HIGH PURITY CONTAINING UP TO ABOUT 3440 PARTS BY WEIGHT OF EUROPIUM PER MILLION PARTS BY WEIGHT OF SAID EUROPIUM-CONTAINING GLASS BASE COMPOSITION, SAID EUROPIUM BEING IN THE FORM OF EUROPOUS (EU+2) ION AND CONTAINING A SUBSTANTIAL QUANTITY OF INCIPIENT METASTABLE COLOR CENTERS WHICH EXHIBIT IN ABSORPTION BAND AT ABOUT 5750 ANGSTROMS IN THE VISIBLE RANGE.
Claim 2
Dependent Claim
81 words
A STRONGLY REDUCED PHOTOTROPIC GLASS COMPOSITION CONSISTING ESSENTIALLY OF A GLASS BASE COMPOSITION SELECTED FROM THE GROUP CONSISTING OF SODA-SILICA AND SODA-LIMESILICA GLASS COMPOSITIONS OF HIGH PURITY CONTAINING UP TO ABOUT 3440 PARTS BY WEIGHT OF EUROPIUM PER MILLION PARTS BY WEIGHT OF SAID EUROPIUM-CONTAINING GLASS BASE COMPOSITION, SAID EUROPIUM BEING IN THE FORM OF EUROPOUS (EU+2) ION AND CONTAINING A SUBSTANTIAL QUANTITY OF INCIPIENT METASTABLE COLOR CENTERS WHICH EXHIBIT IN ABSORPTION BAND AT ABOUT 5750 ANGSTROMS IN THE VISIBLE RANGE.
Claim 3
Dependent Claim
162 words
A PROCESS FOR THE PRODUCTION OF A PHOTOTROPIC GLASS WHICH COMPRISES HEATING A GLASS COMPOSITION CONSISTING ESSENTIALLY OF A GLASS BASE COMPOSITION SELECTED FROM THE GROUP CONSISTING OF SODA-SILICA AND SODA-LIME-SILICA GLASS COMPOSITIONS OF HIGH PURITY CONTAINING UP TO ABOUT 3440 PARTS BY WEIGHT OF EUROPIUM PER MILLION PARTS BY WEIGHT OF SAID EUROPIUM-CONTAINING GLASS BASE COMPOSITION TO A TEMPERATURE ABOVE THE MELTING POINT OF SAID GLASS BASE COMPOSITION IN THE SUBSTANTIAL ABSENCE OF OXYGEN AND IN THE PRESENCE OF CARBON UNTIL A COOLED PORTION OF SAID HEATED MOLTEN GLASS COMPOSITION CONTAINS A SUBSTANTIAL QUANTITY OF INCIPIENT METASTABLE COLOR CENTERS WHICH EXHIBIT AN ABSORPTION BAND AT ABOUT 5750 ANGSTROMS IN THE VISIBLE RANGE, AND IN WHICH A PROPORTION OF THE EUROPIUM IS PRESENT IN THE FORM OF EUROPE (EU+3) IONS, COOLING SAID HEATED MOLTEN GLASS COMPOSITION IN THE SUBSTANTIAL ABSENCE OF OXYGEN AND THEREAFTER IRRADIATING THE COOLED GLASS WITH X-RAY IRRADIATION TO IONIZE EUROPIC (EU+3) IONS TO (EU+3+E-) IONS IN THE GLASS.
Claim 4
Dependent Claim
162 words
A PROCESS FOR THE PRODUCTION OF A PHOTOTROPIC GLASS WHICH COMPRISES HEATING A GLASS COMPOSITION CONSISTING ESSENTIALLY OF A GLASS BASE COMPOSITION SELECTED FROM THE GROUP CONSISTING OF SODA-SILICA AND SODA-LIME-SILICA GLASS COMPOSITIONS OF HIGH PURITY CONTAINING UP TO ABOUT 3440 PARTS BY WEIGHT OF EUROPIUM PER MILLION PARTS BY WEIGHT OF SAID EUROPIUM-CONTAINING GLASS BASE COMPOSITION TO A TEMPERATURE ABOVE THE MELTING POINT OF SAID GLASS BASE COMPOSITION IN THE SUBSTANTIAL ABSENCE OF OXYGEN AND IN THE PRESENCE OF CARBON UNTIL A COOLED PORTION OF SAID HEATED MOLTEN GLASS COMPOSITION CONTAINS A SUBSTANTIAL QUANTITY OF INCIPIENT METASTABLE COLOR CENTERS WHICH EXHIBIT AN ABSORPTION BAND AT ABOUT 5750 ANGSTROMS IN THE VISIBLE RANGE, AND IN WHICH A PROPORTION OF THE EUROPIUM IS PRESENT IN THE FORM OF EUROPE (EU+3) IONS, COOLING SAID HEATED MOLTEN GLASS COMPOSITION IN THE SUBSTANTIAL ABSENCE OF OXYGEN AND THEREAFTER IRRADIATING THE COOLED GLASS WITH X-RAY IRRADIATION TO IONIZE EUROPIC (EU+3) IONS TO (EU+3+E-) IONS IN THE GLASS.
References Cited (Backward Citations)
US2722519A
Cited
US2859163A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-29 | 1970-02-28 | 1970-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-29 | 1974-02-28 | 1974-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-29 | 1978-02-28 | 1978-08-30 | $7700.00 | Window Closed / Lapsed |