US3278319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phototropic glass and method
Assignee: PPG Industries Inc
•
Filing: 1962-08-06
•
Granted: 1966-10-11
•
Expires: 1982-08-06
Abstract
No abstract record available.
Inventors
- 👤 Alvin J Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:14
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/04; C03C4/06; C03C4/065; Y; Y10; Y10S; Y10S501/00; Y10S501/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 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 CERIUM IN THE FORM OF CEROUS (CE+3) ION IN AN AMOUNT UP TO 25 PERCENT BY WEIGHT BASED ON THE WEIGHT OF SAID GLASS BASE COMPOSITION AND WHICH CONTAINS A SUBSTANTIAL QUANTITY OF INCIPIENT METASTABLE COLOR CENTERS WHICH EXHIBIT AN ABSORPTION BAND AT ABOUT 5750 ANGSTROMS IN THE VISIBLE RANGE.
Claim 2
Dependent Claim
78 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 CERIUM IN THE FORM OF CEROUS (CE+3) ION IN AN AMOUNT UP TO 25 PERCENT BY WEIGHT BASED ON THE WEIGHT OF SAID GLASS BASE COMPOSITION AND WHICH CONTAINS A SUBSTANTIAL QUANTITY OF INCIPIENT METASTABLE COLOR CENTERS WHICH EXHIBIT AN ABSORPTION BAND AT ABOUT 5750 ANGSTROMS IN THE VISIBLE RANGE.
References Cited (Backward Citations)
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Cited
US2440048A
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US2862131A
Cited
US2684911A
Cited
US3032428A
Cited
US3134019A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |