US2653949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1-(di-n-butylaminoalkylamino)-4-methylthiaxanthones and synthesis thereof
Assignee: STWB Inc
•
Filing: 1950-11-22
•
Granted: 1953-09-29
•
Expires: 1970-11-22
Abstract
No abstract record available.
Inventors
- 👤 Archer Sydney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:20
CPC Classifications
C; C07; C07D; C07D335/00; C07D335/04; C07D335/10; C07D335/12; C07D335/14; C07D335/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
1 -(2-DI-N-BUTYLAMINOETHYLAMINO) -4METHYLTHIAXANTHONE HAVING THE FORMULA
Claim 2
Dependent Claim
6 words
1 -(2-DI-N-BUTYLAMINOETHYLAMINO) -4METHYLTHIAXANTHONE HAVING 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) | 1956-09-28 | 1957-03-30 | 1957-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-28 | 1961-03-30 | 1961-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-28 | 1965-03-30 | 1965-09-29 | $7700.00 | Window Closed / Lapsed |