US3301689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum fired beryllia ware
Assignee: Materion Brush Inc
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Filing: 1962-02-27
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Granted: 1967-01-31
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Expires: 1982-02-27
Abstract
No abstract record available.
Inventors
- 👤 John G Theodore
- 👤 Chester A Bielawski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:14
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A CASTABLE FIRABLE BERYLLIA SLIP HAVING A HIGH PURITY AND CAPABLE OF BEING SINTERED UNDER VACUUM TO A DENSITY IN EXCESS OF APPROXIMATELY 95 PERCENT THEORETICAL DENSITY, CHARACTERIZED IN THAT THE SLIP CONSISTS ESSENTIALLY OF WATER AND HIGH-PURITY BERYLLIA PARTICLES 85 PERCENT OF WHICH ARE LESS THAN 4 MICRONS IN SIZE AND 100 PERCENT OF WHICH ARE LESS THAN 20 MICRONS IN SIZE, SAID SLIP HAS A PH OF APPROXIMATELY FROM 2.5 TO 7, A SPECIFIC GRAVITY OF FROM ABOUT 1.5 TO MINIMUM SPECIFIC GRAVITY AT WHICH THE SLIP IS CASTABLE, AND A VISCOSITY OF LESS THAN 200 CENTIPOISES BUT SUFFICIENT FOR SLIP CASTINGS.
Claim 2
Dependent Claim
104 words
A CASTABLE FIRABLE BERYLLIA SLIP HAVING A HIGH PURITY AND CAPABLE OF BEING SINTERED UNDER VACUUM TO A DENSITY IN EXCESS OF APPROXIMATELY 95 PERCENT THEORETICAL DENSITY, CHARACTERIZED IN THAT THE SLIP CONSISTS ESSENTIALLY OF WATER AND HIGH-PURITY BERYLLIA PARTICLES 85 PERCENT OF WHICH ARE LESS THAN 4 MICRONS IN SIZE AND 100 PERCENT OF WHICH ARE LESS THAN 20 MICRONS IN SIZE, SAID SLIP HAS A PH OF APPROXIMATELY FROM 2.5 TO 7, A SPECIFIC GRAVITY OF FROM ABOUT 1.5 TO MINIMUM SPECIFIC GRAVITY AT WHICH THE SLIP IS CASTABLE, AND A VISCOSITY OF LESS THAN 200 CENTIPOISES BUT SUFFICIENT FOR SLIP CASTINGS.
References Cited (Backward Citations)
GB665373A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-30 | 1970-08-01 | 1971-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-30 | 1974-08-01 | 1975-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-30 | 1978-08-01 | 1979-01-31 | $7700.00 | Window Closed / Lapsed |