Patent US2912339A successfully refreshed from Google Patents.
US2912339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass composition
Assignee: PPG Industries Inc
•
Filing: 1954-01-13
•
Granted: 1959-11-10
•
Expires: 1974-01-13
Abstract
No abstract record available.
Inventors
- 👤 Earl E Middleswarth
- 👤 James E Duncan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:53
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/11; C03C3/112; C03C1/00; C03C1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
3. GLASS CONSISTING ESSENTIALLY OF 55 TO 75% BY WEIGHT SIO2 11 TO 21% BY WEIGHT OF ALKALI METAL OXIDES SELECTED FROM THE GROUP CONSISTING OF 5 TO 15% BY WEIGHT NA2O, O TO 10% BY WEIGHT K2O AND O TO 15% BY WEIGHT LI2O, O TO 12% BY WEIGHT OF BIVALENT METAL OXIDES SELECTED FROM THE GROUP CONSISTING OF 0 TO 10% BY WEIGHT CAO1 O TO 5% BY WEIGHT PBO, O TO 12% BY WEIGHT ZNO, O TO 12% BY WEIGHT BAO, AND O TO 12% BY WEIGHT MGO, 2 TO 12% BY WEIGHT AL2O3, 1 TO 6% BY WEIGHT F2, 0.2 TO 1.0% BY WEIGHT NIO, 0.5 TO 5.0% BY WEIGHT CUO AND 0 TO 0.05% BY WEIGHT COO, THE TOTAL COMBINED WEIGHT OF NIO, CUO AND COO BEING NOT MORE THAN 50% BY WEIGHT ABOVE OR BELOW THE WEIGHT PERCENTAGE OF FLUORINE.
Claim 2
Dependent Claim
146 words
3. GLASS CONSISTING ESSENTIALLY OF 55 TO 75% BY WEIGHT SIO2 11 TO 21% BY WEIGHT OF ALKALI METAL OXIDES SELECTED FROM THE GROUP CONSISTING OF 5 TO 15% BY WEIGHT NA2O, O TO 10% BY WEIGHT K2O AND O TO 15% BY WEIGHT LI2O, O TO 12% BY WEIGHT OF BIVALENT METAL OXIDES SELECTED FROM THE GROUP CONSISTING OF 0 TO 10% BY WEIGHT CAO1 O TO 5% BY WEIGHT PBO, O TO 12% BY WEIGHT ZNO, O TO 12% BY WEIGHT BAO, AND O TO 12% BY WEIGHT MGO, 2 TO 12% BY WEIGHT AL2O3, 1 TO 6% BY WEIGHT F2, 0.2 TO 1.0% BY WEIGHT NIO, 0.5 TO 5.0% BY WEIGHT CUO AND 0 TO 0.05% BY WEIGHT COO, THE TOTAL COMBINED WEIGHT OF NIO, CUO AND COO BEING NOT MORE THAN 50% BY WEIGHT ABOVE OR BELOW THE WEIGHT PERCENTAGE OF FLUORINE.
References Cited (Backward Citations)
GB430387A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-09 | 1963-05-11 | 1963-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-09 | 1967-05-11 | 1967-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-09 | 1971-05-11 | 1971-11-10 | $7700.00 | Window Closed / Lapsed |