US2494699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of dielectric materials
Assignee: Balfour Beatty PLC
•
Filing: 1948-01-07
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Granted: 1950-01-17
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Expires: 1968-01-07
Abstract
No abstract record available.
Inventors
- 👤 Forrester William Francis
- 👤 Hinde Robert Malcolm
- 👤 Szigeti Bela
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:16
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682; Y; Y10; Y10S; Y10S264/00; Y10S264/25
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
120 words
A METHOD OF MANUFACTURE FROM BARIUM AND STRONTIUM TITANATES OF A CERAMIC BODY HAVING A HIGH PERMITTIVITY BETWEEN PREDETERMINED MAXIMUM AND MINIMUM VALUES OVER A DESIRED TEMPERATURE RANGE, COMPRISING FORMING FROM THE SAID TITANATES AT LEAST TWO SOLID SOLUTIONS EACH HAVING PROPORTIONS OF THE SAID TITANATES DIFFERENT FROM THE PROPORTIONS IN ANY OTHER OF THE SAID SOLUTIONS AND EACH HAVING ITS MAXIMUM PERMITTIVITY AT A TEMPERATURE DIFFERENT FROM THE TEMPERATURE FOR MAXIMUM PERMITTIVITY OF ANY OTHER OF THE SAID SOLUTIONS, EACH OF SAID TEMPERATURES BEING WITHIN THE DESIRED TEMPERATURE RANGE, REDUCING THE SAID SOLUTIONS TO POWDER, AND COMBINING PORTIONS OF THE POWDERED SOLID SOLUTIONS INTO AN INTEGRAL BODY BY HEAT TREATMENT, WITHOUT DESTROYING THE IDENTITIES OF THE SAID SOLID SOLUTIONS.
References Cited (Backward Citations)
US1688422A
Cited
US1727580A
Cited
US1852676A
Cited
US2193635A
Cited
US2420692A
Cited
US2443211A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-16 | 1953-07-18 | 1954-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-16 | 1957-07-18 | 1958-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-16 | 1961-07-18 | 1962-01-17 | $7700.00 | Window Closed / Lapsed |