US2819288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyhydroxy-beta-acylaminoanthraquinones
Assignee: BASF Schweiz AG
•
Filing: 1956-03-19
•
Granted: 1958-01-07
•
Expires: 1976-03-19
Abstract
No abstract record available.
Inventors
- 👤 Grossmann Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:32
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/50; C09B1/51; C09B1/516; C09B1/5165; Y; Y10; Y10S; Y10S8/00; Y10S8/93; Y10S8/931
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
A POLYHYDROXY-ACYLAMINOANTHRAQUINONE OF THE FORMULA
Claim 2
Dependent Claim
5 words
A POLYHYDROXY-ACYLAMINOANTHRAQUINONE OF THE FORMULA
References Cited (Backward Citations)
US2522034A
Cited
US2691027A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |