Patent US2193291A successfully refreshed from Google Patents.
Patent US3563771A successfully refreshed from Google Patents.
US3563771A
Expired / Lapsed
US
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Novel black glass bead products
Assignee: 3M Co
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Filing: 1968-02-28
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Granted: 1971-02-16
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Expires: 1988-02-28
Abstract
Abstract NOVEL, ESSENTIALLY NONDEVITRIFIED, BLACK GLASS ELEMENTS OF HIGH REFRACTIVE INDEX WHICH ARE HIGHLY TRANSMISSIVE TO INFRARED LIGHT AND HIGHLY ABSORPTIVE OF VISIBLE LIGHT, SAID GLASS CONSISTING ESSENTIALLY OF A BASE GLASS COMPONENT HAVING INGREDIENTS CAPABLE OF FORMING A GLASS WITH AN INDEX OF REFRACTION OF AT LEAST 1.6 AND DISSOLVED LIGHT FILTERING COMPONENTS CONSISTING ESSENTIALLY OF 0.1-3 WEIGHT PERCENT CR2O3, 1-15 WEIGHT PERCENT MNO2, 0.1-10 WEIGHT PERCENT COO, 0-8.7 WEIGHT PERCENT V2O5, 0-10 WEIGHT PERCENT FEO, 0-5 WEIGHT PERCENT NIO, 0-5 WEIGHT PERCENT CUO, 0-15 WEIGHT PERCENT CEO2.
Inventors
- 👤 Chi Fang Tung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:43
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/10; C03C1/00; C03C1/10; C03C3/00; C03C3/12; C03C3/127; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/904
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |