US3296004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Neutral brown heat absorbing glass composition
Assignee: PPG Industries Inc
•
Filing: 1963-08-12
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Granted: 1967-01-03
•
Expires: 1983-08-12
Abstract
No abstract record available.
Inventors
- 👤 James E Duncan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:39
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085; C03C3/087; C03C1/00; C03C1/10; C03C3/078
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A NEUTRAL BROWN COLORED, HEAT ABSORBING GLASS HAVING SUBSTANTIALLY UNIFORM TRANSMITTANCE OF LIGHT IN THE PORTION OF THE SPECTRUM LYING BETWEEN 400 AND 750 MILLIMICRONS AND AN EXCITATION PURITY BETWEEN 6 AND 12 PERCENT, CONSISTING ESSENTIALLY OF THE FOLLOWING INGREDIENTS IN PERCENT BY WEIGHT; 60 TO 75 PERCENT SIO2, 11 TO 20 PERCENT NA2O, 0 TO 10 PERCENT KA2O, THE SUM OF MA2O AND K2O BEING 11 TO 21 PERCENT, 6 TO 16 PERCENT CAO, 0 TO 10 PERCENT MGO, THE SUM OF CAO AND MGO BEING 6 TO 20 PERCENT, 0.2 TO 1 PERCENT FE2O3, 0.001 TO 0.02 PERCENT COO AND 0.0005 TO 0.02 PERCENT SE. THE AMOUNTS OF SE, COO AND FE2O3 BEING COORDINATED TO PRODUCE A NEUTRAL BROWN GLASS HAVING SAID TRANSMITTANCE PROPERTIES.
Claim 2
Dependent Claim
126 words
A NEUTRAL BROWN COLORED, HEAT ABSORBING GLASS HAVING SUBSTANTIALLY UNIFORM TRANSMITTANCE OF LIGHT IN THE PORTION OF THE SPECTRUM LYING BETWEEN 400 AND 750 MILLIMICRONS AND AN EXCITATION PURITY BETWEEN 6 AND 12 PERCENT, CONSISTING ESSENTIALLY OF THE FOLLOWING INGREDIENTS IN PERCENT BY WEIGHT; 60 TO 75 PERCENT SIO2, 11 TO 20 PERCENT NA2O, 0 TO 10 PERCENT KA2O, THE SUM OF MA2O AND K2O BEING 11 TO 21 PERCENT, 6 TO 16 PERCENT CAO, 0 TO 10 PERCENT MGO, THE SUM OF CAO AND MGO BEING 6 TO 20 PERCENT, 0.2 TO 1 PERCENT FE2O3, 0.001 TO 0.02 PERCENT COO AND 0.0005 TO 0.02 PERCENT SE. THE AMOUNTS OF SE, COO AND FE2O3 BEING COORDINATED TO PRODUCE A NEUTRAL BROWN GLASS HAVING SAID TRANSMITTANCE PROPERTIES.
References Cited (Backward Citations)
US2938808A
Cited
US2902377A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-02 | 1970-07-04 | 1971-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-02 | 1974-07-04 | 1975-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-02 | 1978-07-04 | 1979-01-03 | $7700.00 | Window Closed / Lapsed |