US3046148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dense, non-browning, plate glass composition
Assignee: PPG Industries Inc
•
Filing: 1961-05-19
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Granted: 1962-07-24
•
Expires: 1981-05-19
Abstract
No abstract record available.
Inventors
- 👤 Earl T Middleswarth
- 👤 James E Duncan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:07
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/102; C03C3/095
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A GLASS CONSISTING OF THE FOLLOWING INGREDIENTS IN PERCENT BY WEIGHT: 42 TO 51 PERCENT SIO2, 30 TO 38 PERCENT PBO, 12 TO 22 PERCENT K2O, 0.3 TO 2 PERCENT F, 0.5 TO 3 PERCENT CEO2, 0 TO 2 PERCENT CAO AND O TO 1.5 PERCENT NA2O, SAID F BEING PRESENT IN SAID GLASS TO PROVIDE AN INCREASE IN LUMINOUS TRANSMITTANCE.
Claim 2
Dependent Claim
61 words
A GLASS CONSISTING OF THE FOLLOWING INGREDIENTS IN PERCENT BY WEIGHT: 42 TO 51 PERCENT SIO2, 30 TO 38 PERCENT PBO, 12 TO 22 PERCENT K2O, 0.3 TO 2 PERCENT F, 0.5 TO 3 PERCENT CEO2, 0 TO 2 PERCENT CAO AND O TO 1.5 PERCENT NA2O, SAID F BEING PRESENT IN SAID GLASS TO PROVIDE AN INCREASE IN LUMINOUS TRANSMITTANCE.
References Cited (Backward Citations)
US2579709A
Cited
US2856303A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-07-23 | 1966-01-22 | 1966-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-23 | 1970-01-22 | 1970-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-23 | 1974-01-22 | 1974-07-24 | $7700.00 | Window Closed / Lapsed |