Patent US2803554A successfully refreshed from Google Patents.
US2803554A
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Low loss ceramic insulators and method of manufacture
Assignee: Star Porcelain Co
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Filing: 1955-07-06
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Granted: 1957-08-20
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Expires: 1975-07-06
Abstract
No abstract record available.
Inventors
- 👤 Robert D Fenity
- 👤 Cameron G Harman
- 👤 Wainer Eugene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:57
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/102; C03C3/105; H; H01; H01B; H01B3/00; H01B3/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
132 words
A METHOD OF MAKING CERAMIC BODIES HAVING LOSS FACTORS NOT GREATER THAN ABOUT 0.004, WHICH COMPRISES PREPARING A FRIT CONSISTING ESSENTIALLY OF BETWEEN ABOUT 10% AND ABOUT 25% BY WEIGHT PBO, BETWEEN ABOUT 65% AND ABOUT 75% BY WEIGHT SIO2 AND FROM 0 TO ABOUT 16% BY WEIGHT OF A TRIVALENT METAL OXIDE SELECTED FROM THE GROUP CONSISTING OF B2O3, AL2O3, AND MIXTURES OF B2O3 AND AL2O3, THE PROPORTION OF B2O3 IN NO CASE EXCEEDING ABOUT 1/% ON THE WEIGHT OF SAID FRIT AND THE PROPORTION OF AL2O3, IN NO CASE EXCEEDING ABOUT 6% ON THE WEIGHT OF SAID FRIT, REDUCING SAID FRIT TO FINELY DIVIDED FORM AND MIXING THE FRIT, WITH A SUBSTANTIALLY INERT FILLER SHAPING THE MIXTURE OF FRIT AND FILLER, FIRING THE SHAPED MIXTURE AND ANNEALING THE FIRED MIXTURE.
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) | 1960-08-19 | 1961-02-18 | 1961-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-19 | 1965-02-18 | 1965-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-19 | 1969-02-18 | 1969-08-20 | $7700.00 | Window Closed / Lapsed |