Patent US3240614A successfully refreshed from Google Patents.
US3240614A
Expired / Lapsed
US
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Bonded boron nitride
Assignee: Unifrax I LLC
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Filing: 1963-09-19
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Granted: 1966-03-15
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Expires: 1983-09-19
Abstract
No abstract record available.
Inventors
- 👤 Murata Yorihiro
- 👤 Labosky Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:59
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B3/08; H01B3/085; C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/583; H01B3/087
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
76 words
A THERMAL SHOCK RESISTANT CERAMIC INSULATOR COMPRISING A HOT PRESSED, EASILY MACHINABLE BODY HAVING A SPECIFIC GRAVITY OF AT LEAST 2.16, WHICH CONSISTS ESSENTIALLY OF RECRYSTALLIZED BORON NITRIDE PARTICLES DISPERSED IN A GLASSY MATRIX CONSISTING ESSENTIALLY OF SILICA, SAID INSULATOR BEING CHARACTERIZED BY A DIELECTRIC CONSTANT OF FROM ABOUT 2.5 TO 4.5 (MEASURED AT 1KC. AND 25*C.) AND A DISSIPATION FACTOR OF FROM 1X10-4 TO 10X10-4, SAID PARTICLES COMPRISING FROM 30% TO 70% OF SAID BODY.
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) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |