US2811523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
3, 4-dihydro-2h-1, 3-benzoxazines
Assignee: Dow Chemical Co
•
Filing: 1956-03-02
•
Granted: 1957-10-29
•
Expires: 1976-03-02
Abstract
No abstract record available.
Inventors
- 👤 Raymond H Rigterink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:40
CPC Classifications
C; C07; C07D; C07D265/00; C07D265/04; C07D265/12; C07D265/14; C07D265/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
A 3,4-DIHYDRO-2H-1,3-BENZOXAZINE HAVING THE FORMULA:
Claim 2
Dependent Claim
5 words
A 3,4-DIHYDRO-2H-1,3-BENZOXAZINE HAVING THE FORMULA:
References Cited (Backward Citations)
US2633466A
Cited
GB695550A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-28 | 1961-04-29 | 1961-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-28 | 1965-04-29 | 1965-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-28 | 1969-04-29 | 1969-10-29 | $7700.00 | Window Closed / Lapsed |