US3000745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vitreous materials
Assignee: Welwyn Electrcal Laboratories Ltd
•
Filing: 1956-09-12
•
Granted: 1961-09-19
•
Expires: 1976-09-12
Abstract
No abstract record available.
Inventors
- 👤 Cianchi Alfredo Luigi Giuseppe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:13
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/16; C03C10/0054; H; H01; H01B; H01B3/00; H01B3/02; H01B3/08; H01B3/087; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/129
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A PROCESS FOR THE PRODUCTION OF A VITREOUS DIELECTRIC MATERIAL WHICH CONTAINS A CRYSTALLINE PHASE AS EVIDENCED BY ITS X-RAY DIFFRACTION PATTERN, HAS A SOFTENING POINT BELOW 700*C. AND HAS A HIGH COEFFICIENT OF THERMAL EXPANSION MATCHING THAT OF COPPER, WHICH COMPRISES FORMING A GLASS BATCH OF THE FOLLOWING OXIDES IN THE PROPORTIONS SPECIFIED:
Claim 2
Dependent Claim
54 words
A PROCESS FOR THE PRODUCTION OF A VITREOUS DIELECTRIC MATERIAL WHICH CONTAINS A CRYSTALLINE PHASE AS EVIDENCED BY ITS X-RAY DIFFRACTION PATTERN, HAS A SOFTENING POINT BELOW 700*C. AND HAS A HIGH COEFFICIENT OF THERMAL EXPANSION MATCHING THAT OF COPPER, WHICH COMPRISES FORMING A GLASS BATCH OF THE FOLLOWING OXIDES IN THE PROPORTIONS SPECIFIED:
References Cited (Backward Citations)
US2738284A
Cited
US2069903A
Cited
US2220765A
Cited
US2220775A
Cited
US2277733A
Cited
US2347187A
Cited
US2377910A
Cited
US2576379A
Cited
US2721182A
Cited
US2863782A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |