US3840562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
3-amino lower alkyl-1-phenylisochromans and their preparation
Assignee: Riker Laboratories Inc
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Filing: 1971-08-25
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Granted: 1974-10-08
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Expires: 1991-08-25
Abstract
Abstract 1. A 1-PHENYLISOCHROMAN COMPOUND OF THE FORMULA 1-(R-PHENYL-),3-(CL-(CH2)M-),3-(CL-),R1,R2-ISOCHROMAN WHEREIN M IS AN INTEGER FROM 1 TO 4, AND THE ALKYLENE CHAIN MAY CONTAIN A SUBSTITUENT METHYL GROUP; R IS HYDROGEN, LOWER ALKYL, HALOGEN, TRIFLUOROMETHYL, AMINO, NLOWER ALKYLAMINO OR N,N-DI-LOWER ALKYLAMINO; R1 AND R2 ARE EACH HYDROGEN, LOWER ALKYL, HALOGEN, TRIFLUOROMETHYL, HYDROXY OR LOWER ALKOXY; AND R3 IS HYDROGEN OR LOWER ALKYL.
Inventors
- 👤 J Bolger
- 👤 F Petracek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:10
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/04; C07D311/58; C07D311/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
A 1-PHENYLISOCHROMAN COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
6 words
A 1-PHENYLISOCHROMAN COMPOUND OF THE FORMULA
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) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |