US3578403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recrystallization of pyrolytic boron nitride
Assignee: Union Carbide Corp
•
Filing: 1968-07-05
•
Granted: 1971-05-11
•
Expires: 1988-07-05
Abstract
Abstract A METHOD FOR STRUCTURALLY TRANSFORMING PYROLYTIC BORON NITRIDE INTO A PRODUCT CLOSELY RELATED TO A SINGLE CRYSTAL HEXAGONAL BORON NITRIDE STRUCTURE BY SUBJECTING A DISC OR PLATE OF THE STARTING MATERIAL TO A SIMULTANEOUS TEMPERATURE OF AT LEAST 2250*C. AND PRESSURE OF 5000 P.S.I. IN A NON-REACTIVE ATMOSPHERE. THE PRESSURE IS APPLIED UNIAXIALLY IN THE PREDOMINANT DIRECTION OF THE C-AXES AND APPLIED SO AS TO PLACE THE MATERIAL IN COMPRESSION.
Inventors
- 👤 Arthur W Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:29
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/06; C01B21/064; C01B21/0648; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/583
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |