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Patent US4233226A successfully refreshed from Google Patents.
US4233226A
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Novel hexahydrobenzopyran derivative and method of preparing the same
Assignee: Mitsubishi Chemical Corp
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Filing: 1979-08-24
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Granted: 1980-11-11
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Expires: 1999-08-24
Abstract
Abstract 4a,5,6,7,8,8a-Hexahydro-4,7-dimethyl-4H-1-benzopyran of the formula: ##STR1## and a method for preparing the same.
Inventors
- 👤 Makoto Takeda
- 👤 Hiroshi Iwane
- 👤 Takashi Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:45
CPC Classifications
C; C11; C11B; C11B9/00; C11B9/0069; C11B9/0073; C11B9/008; C07; C07D; C07D311/00; C07D311/02; C07D311/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
4a,5,6,7,8,8a-hexahydro-4,7-dimethyl-4H-1-benzopyran of the formula: ##STR6##
Claim 2
Dependent Claim
5 words
4a,5,6,7,8,8a-hexahydro-4,7-dimethyl-4H-1-benzopyran of the formula: ##STR6##
References Cited (Backward Citations)
US2675393A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |