US3746556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemically resistant aluminophosphate glasses
Assignee: Corning Glass Works
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Filing: 1971-10-12
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Granted: 1973-07-17
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Expires: 1991-10-12
Abstract
Abstract GLASSES RESISTANT TO CHEMICAL ATTACH, IN PARTICULAR ATTACH BY FLUORIDES, ARE DISCLOSED. THESE ARE ALUMINOPHOSPHATE BASE GLASSES CONTAINING ONE OR MORE ALKALI METAL OXIDES, WITH OR WITHOUT ZINC OR CUPRIC OXIDE, AS MODIFYING OXIDES. THE GLASS COMPOSITIONS CONSIST ESSENTIALLY, ON A MOLE PERCENT BASIS, OF 60-75% P2O5, 20-25% AL2O3, 1.5-12% R2O, AND 0-12% ZNO PLUS CUO, THE TOTAL R2O PLUS ZNO BEING AT LEAST 3%.
Inventors
- 👤 D Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:42
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/16; C03C3/17
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |