Patent US3920809A successfully refreshed from Google Patents.
US3920809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dibenzo(b,d)pyranone dispersions
Assignee: Eli Lilly and Co
•
Filing: 1973-11-05
•
Granted: 1975-11-18
•
Expires: 1993-11-05
Abstract
Abstract 1-Hydroxy-3-alkyl-9-keto or 9-hydroxyhexahydro dibenzo(b, d)pyrans, useful as tranquilizers or hypotensive agents are dispersed with PVP or polyethylene glycol.
Inventors
- 👤 Arvind L Thakkar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:15
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/14; A61K9/141; A61K9/146; A61K31/00; A61K31/33; A61K31/335; A61K31/35
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
24 words
A DISPERSION OF 2-20 PARTS OF POLYVINYLPYRROLIDONE HAVING A MOLECULAR WEIGHT IN THE RANGE 10,000-360,000 WITH ONE PART OF A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
24 words
A DISPERSION OF 2-20 PARTS OF POLYVINYLPYRROLIDONE HAVING A MOLECULAR WEIGHT IN THE RANGE 10,000-360,000 WITH ONE PART OF A COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
26 words
A dispersion according to claim 1 containing 1 part of 1-hydroxy-3-(1'',1''-dimethylheptyl)-6,6-dimethyl-6,6a,7,8,10,10a-hexahydro-9H-dibenzo(b,d)pyran-9-one and 9 part of a polyvinylpyrrolidone having a molecular weight in the range 10, 000-360,000.
Claim 4
Dependent Claim
11 words
A dispersion according to claim 1 wherein the compound is 1-hydroxy-3-(1'',1''-dimethylheptyl)-6,6-dimethyl-6,6a,7,8,10,10a-hexahydro-9H-dibenzo(b,d)pyran-9-one.
Claim 5
Dependent Claim
15 words
A dispersion according to claim 3 of polyvinylpyrrolidone of molecular weight 40,000 and 1-hydroxy-3-(1'',1''-dimethylheptyl)-6, 6-dimethyl-6,6a,7,8,10,10a-hexahydro-9H-dibenzo(b,d)pyran-9-one.
References Cited (Backward Citations)
US3507885A
Cited
US3636058A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |