Patent US3215739A successfully refreshed from Google Patents.
US3215739A
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Method of producing dibenzo (a, d) cyclohepta (1, 4) dienes
Assignee: H Lundbeck AS
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Filing: 1961-10-10
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Granted: 1965-11-02
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Expires: 1981-10-10
Abstract
No abstract record available.
Inventors
- 👤 Torkil O Holm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:10
CPC Classifications
C; C07; C07C; C07C211/00; C07C211/01; C07C211/26; C07C211/31; C07C211/32; C07C1/00; C07C1/20; C07C1/24; C07C13/00; C07C13/28; C07C13/32; C07C13/54; C07C13/547; C07C35/00; C07C35/22; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/30; C07C2603/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
17 words
THE PROCESS OF PRODUCING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF DIBENZO(A,D)CYCLOHEPTA(1,4) DIENES OF THE FORMULA:
Claim 2
Dependent Claim
17 words
THE PROCESS OF PRODUCING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF DIBENZO(A,D)CYCLOHEPTA(1,4) DIENES OF THE FORMULA:
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) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |