US3847625A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lead free glass composition
Assignee: International Standard Electric Corp
•
Filing: 1972-08-14
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Granted: 1974-11-12
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Expires: 1992-08-14
Abstract
Abstract A lead free manganese containing range of glass compositions which have their surface layer rendered electrically conductive by an oxidizing process which does not produce water vapor.
Inventors
- 👤 C Drake
- 👤 R Amos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:03
CPC Classifications
H; H01; H01J; H01J43/00; H01J43/04; H01J43/06; H01J43/18; H01J43/24; C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/078; C03C3/083; C03C3/085; C03C3/087; C03C4/00; C03C4/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
80 words
A LEAD-FREE GLASS COMPOSITION OF THE TYPE CONTAINING SILICON, MANGANESE, AND A QUANTITY OF ALKALI METAL AND WHEREIN THE SURFACE IS RENDERED ELECTRICALLY CONDUCTIVE BY OXIDATION, THE COMPOSITION COMPRISING IN COMBINATION: 40 - 67 MOLE PERCENT SIO2; 12 - 27 MOLE PERCENT MNO; 5 - 20 MOLE PERCENT NA2O+K20; 5 - 20 MOLE PERCENT CAO+MGO; AND 0 - 3 MOLE PERCENT AL2O3, THE COMPOSITION CONTAINING NOT MORE THAN 40 MOLE PERCENT IN AGGREGATE OF OXIDES OF MANGANESE, CALCIUM, AND MAGNESIUM.
Claim 2
Dependent Claim
80 words
A LEAD-FREE GLASS COMPOSITION OF THE TYPE CONTAINING SILICON, MANGANESE, AND A QUANTITY OF ALKALI METAL AND WHEREIN THE SURFACE IS RENDERED ELECTRICALLY CONDUCTIVE BY OXIDATION, THE COMPOSITION COMPRISING IN COMBINATION: 40 - 67 MOLE PERCENT SIO2; 12 - 27 MOLE PERCENT MNO; 5 - 20 MOLE PERCENT NA2O+K20; 5 - 20 MOLE PERCENT CAO+MGO; AND 0 - 3 MOLE PERCENT AL2O3, THE COMPOSITION CONTAINING NOT MORE THAN 40 MOLE PERCENT IN AGGREGATE OF OXIDES OF MANGANESE, CALCIUM, AND MAGNESIUM.
Claim 3
Dependent Claim
66 words
A lead-free glass composition of the type containing silicon, manganese, and a quantity of alkali metal and wherein the surface is rendered electrically conductive by oxidation, the composition comprising in combination: 57 - 62 mole percent SiO2; 12 - 18 mole percent MnO; 15 - 17 mole percent Na2O + K2O; 8 - 10 mole percent CaO + MgO; and 0 - 1 mole percent Al2O3.
Claim 4
Dependent Claim
66 words
A lead-free glass composition of the type containing silicon, manganese, and a quantity of alkali metal and wherein the surface is rendered electrically conductive by oxidation, the composition comprising in combination: 57 - 62 mole percent SiO2; 12 - 18 mole percent MnO; 15 - 17 mole percent Na2O + K2O; 8 - 10 mole percent CaO + MgO; and 0 - 1 mole percent Al2O3.
Claim 5
Dependent Claim
19 words
A composition, according to claim 1, having a surface conductivity in the range 106 to 1014 10ohms per square.
References Cited (Backward Citations)
US3093598A
Cited
US3342753A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |