US2966420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic dielectric process
Assignee: Sprague Electric Co
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Filing: 1957-05-03
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Granted: 1960-12-27
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Expires: 1977-05-03
Abstract
No abstract record available.
Inventors
- 👤 Thomas I Prokopowicz
- 👤 Daniel R Norton
- 👤 Brown Fielding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:53
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A PROCESS FOR PRODUCING HIGH DIELECTRIC CONSTANT CERAMIC BODIES, SAID PROCESS BEING CHARACTERIZED BY THE STEPS OF MIXING EXCESS TITANIA IN THE RANGE OF FOUR TO NINE MOLE PERCENT WITH CHEMICALLY PURE STOICHIOMETRIC BARIUM TITANATE HAVING GRAIN SIZE OF APPROXIMATELY ONE MICRON AND SUBSTANTIALLY ALL GRAINS LESS THAN TWO MICRONS, PRESSING THE MIXTURE INTO BODIES FOR FIRING, AND THEN SINTERING THE BODIES IN AN AIR ATMOSPHERE IN A TEMPERATURE RANGE OF 1275*C. TO 1320*C. FOR FROM ONE TO FOUR HOURS, WHEREBY THE SINTERED BODIES EXHIBIT A POROSITY OF NOT MORE THAN TWO PERCENT.
Claim 2
Dependent Claim
93 words
A PROCESS FOR PRODUCING HIGH DIELECTRIC CONSTANT CERAMIC BODIES, SAID PROCESS BEING CHARACTERIZED BY THE STEPS OF MIXING EXCESS TITANIA IN THE RANGE OF FOUR TO NINE MOLE PERCENT WITH CHEMICALLY PURE STOICHIOMETRIC BARIUM TITANATE HAVING GRAIN SIZE OF APPROXIMATELY ONE MICRON AND SUBSTANTIALLY ALL GRAINS LESS THAN TWO MICRONS, PRESSING THE MIXTURE INTO BODIES FOR FIRING, AND THEN SINTERING THE BODIES IN AN AIR ATMOSPHERE IN A TEMPERATURE RANGE OF 1275*C. TO 1320*C. FOR FROM ONE TO FOUR HOURS, WHEREBY THE SINTERED BODIES EXHIBIT A POROSITY OF NOT MORE THAN TWO PERCENT.
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) | 1963-12-27 | 1964-06-27 | 1964-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-27 | 1968-06-27 | 1968-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-27 | 1972-06-27 | 1972-12-27 | $7700.00 | Window Closed / Lapsed |