US2561325A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultraviolet transmitting glass
Assignee: PPG Industries Inc
•
Filing: 1948-06-26
•
Granted: 1951-07-24
•
Expires: 1968-06-26
Abstract
No abstract record available.
Inventors
- 👤 Duncan James Earle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:23
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/089; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/905
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A SUBSTANTIALLY COLORLESS GLASS, PERMEABLE TO ULTRA VOILET LIGHT RAYS OF THE SOLAR SPECTRUM, WHICH CONTAINS FROM 55 TO 70% OF SILICA, 13 TO 20% OF SODIUM AND POTASSIUM OXIDES, 5 TO 10% OF CALCIUM OXIDE, 3 TO 6% OF BORIC OXIDE, 1 TO 5% OF ZINC OXIDE AND FROM 0.2 TO 0.6 PERCENT OF CADMIUM SULFIDE.
Claim 2
Dependent Claim
57 words
A SUBSTANTIALLY COLORLESS GLASS, PERMEABLE TO ULTRA VOILET LIGHT RAYS OF THE SOLAR SPECTRUM, WHICH CONTAINS FROM 55 TO 70% OF SILICA, 13 TO 20% OF SODIUM AND POTASSIUM OXIDES, 5 TO 10% OF CALCIUM OXIDE, 3 TO 6% OF BORIC OXIDE, 1 TO 5% OF ZINC OXIDE AND FROM 0.2 TO 0.6 PERCENT OF CADMIUM SULFIDE.
References Cited (Backward Citations)
US1536920A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-23 | 1955-01-22 | 1955-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-23 | 1959-01-22 | 1959-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-23 | 1963-01-22 | 1963-07-24 | $7700.00 | Window Closed / Lapsed |