US3306757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High alkali earth oxide glass bead composition
Assignee: Lukens General Industries Inc
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Filing: 1963-02-18
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Granted: 1967-02-28
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Expires: 1983-02-18
Abstract
No abstract record available.
Inventors
- 👤 D Adrian Vincent L Duval
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:50
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/14; C03C3/04; C03C3/062; C03C3/064; C03C3/076; C03C3/089
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A SUBSTANTIALLY PERFECTLY SPHERICAL HIGH REFRACTIVE INDEX GLASS HEAD FOR USE IN REFLECTIVE PAINTS AND BEING OF A SIZE FROM ABOUT 20 MESH TO 230 MESH HAVING A REFRACTIVE INDEX OF ABOUT 1.60 TO 1.75 PREPARED FROM A CHARGE CHARACTERIZED BY A LOW VISCOSITY AT 2200*F. TO 2800*F. AND CONSISTING ESSENTIALLY OF A LEAST TWO MEMBERS OF THE GROUP CONSISTING OF SILICA, TITANIUM DIOXIDE AND ZIRCON, AT LEAST ONE OF SAID MEMBERS BEING SILICA, A FLUX IN A LESSER AMOUNT THAN SAID FIRST NAMED COMPONENT AND CONSISTING OF AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF BORAX AND BORIC ACID AND A BARIUM COMPOUND WHICH IS CONVERTIBLE AT HIGH TEMPERATURE TO AN OXIDE, SAID BARIUM COMPOUND BEING PRESENT IN THE CHARGE IN THE AMOUNT OF A LEAST ABOUT ONE-HALF THE WEIGHT OF THE CHARGE, AND SAID CHARGE BEING FUSIBLE TO A LOW VISCOSITY.
Claim 2
Dependent Claim
144 words
A SUBSTANTIALLY PERFECTLY SPHERICAL HIGH REFRACTIVE INDEX GLASS HEAD FOR USE IN REFLECTIVE PAINTS AND BEING OF A SIZE FROM ABOUT 20 MESH TO 230 MESH HAVING A REFRACTIVE INDEX OF ABOUT 1.60 TO 1.75 PREPARED FROM A CHARGE CHARACTERIZED BY A LOW VISCOSITY AT 2200*F. TO 2800*F. AND CONSISTING ESSENTIALLY OF A LEAST TWO MEMBERS OF THE GROUP CONSISTING OF SILICA, TITANIUM DIOXIDE AND ZIRCON, AT LEAST ONE OF SAID MEMBERS BEING SILICA, A FLUX IN A LESSER AMOUNT THAN SAID FIRST NAMED COMPONENT AND CONSISTING OF AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF BORAX AND BORIC ACID AND A BARIUM COMPOUND WHICH IS CONVERTIBLE AT HIGH TEMPERATURE TO AN OXIDE, SAID BARIUM COMPOUND BEING PRESENT IN THE CHARGE IN THE AMOUNT OF A LEAST ABOUT ONE-HALF THE WEIGHT OF THE CHARGE, AND SAID CHARGE BEING FUSIBLE TO A LOW VISCOSITY.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |