Patent US2764596A successfully refreshed from Google Patents.
US2764596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inorganic acid esters of polyhydroxylated flavones and flavanones
Assignee: National Drug Co
•
Filing: 1952-07-01
•
Granted: 1956-09-25
•
Expires: 1972-07-01
Abstract
No abstract record available.
Inventors
- 👤 Avakian Souren
- 👤 Beiler Jay Morton
- 👤 Gustav J Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:01
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/04; C07D311/22; C07D311/26; C07D311/28; C07D311/32; C07D311/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
28 words
ESTERS OF (1) POLYDROXYLATED HETEROCYCLIC COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF FLAVONES AND FLAVANONES AND (2) INORGANIC ACIDS OF THE GROUP CONSISTING OF PHOSPHORIC AND SULFURIC ACIDS.
Claim 2
Dependent Claim
28 words
ESTERS OF (1) POLYDROXYLATED HETEROCYCLIC COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF FLAVONES AND FLAVANONES AND (2) INORGANIC ACIDS OF THE GROUP CONSISTING OF PHOSPHORIC AND SULFURIC ACIDS.
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) | 1959-09-25 | 1960-03-26 | 1960-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-25 | 1964-03-26 | 1964-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-25 | 1968-03-26 | 1968-09-25 | $7700.00 | Window Closed / Lapsed |