US2201151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boron carbide composition
Assignee: Unifrax I LLC
•
Filing: 1938-02-18
•
Granted: 1940-05-21
•
Expires: 1958-02-18
Abstract
No abstract record available.
Inventors
- 👤 John A Boyer
- 👤 Carl G Rose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:07
CPC Classifications
C; C22; C22C; C22C29/00; C22C29/02; C22C29/06; C22C29/062; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/991
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) | 1943-05-21 | 1943-11-20 | 1944-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-05-21 | 1947-11-20 | 1948-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-05-21 | 1951-11-20 | 1952-05-21 | $7700.00 | Window Closed / Lapsed |