US4096000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Annealing separator for silicon steel sheets
Assignee: Nippon Steel Corp
•
Filing: 1974-04-08
•
Granted: 1978-06-20
•
Expires: 1994-04-08
Abstract
Abstract An annealing separator for silicon steel sheets comprising not less than 90.00% by weight of an MgO and 0.01 to 2.0% by weight of B2O3 in the form of nMgO.B2O3 with the balance being unavoidable impurities.
Inventors
- 👤 Toshiya Wada
- 👤 Toshihiko Takata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:29
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/68; C21D1/70; C23; C23D; C23D5/00; C23D5/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
43 words
An annealing separator for silicon steel sheets consisting essentially of not less than 90.00% by weight of MgO and 0.01 to 2.0% by weight of B 2 O 3 in the form of nMgO.B 2 O 3 with the balance being unavoidable impurities.
Claim 2
Dependent Claim
43 words
An annealing separator for silicon steel sheets consisting essentially of not less than 90.00% by weight of MgO and 0.01 to 2.0% by weight of B 2 O 3 in the form of nMgO.B 2 O 3 with the balance being unavoidable impurities.
Claim 3
Dependent Claim
25 words
An annealing separator according to claim 1, in which the B 2 O 3 is present in the form of 3MgO.B 2 O 3 .
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) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |