US2813852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disazo and polyazo dyestuffs
Assignee: Saul and Co
•
Filing: 1955-04-11
•
Granted: 1957-11-19
•
Expires: 1975-04-11
Abstract
No abstract record available.
Inventors
- 👤 Grandjean Philippe
- 👤 Kchrer Fritz
- 👤 Schneider Lukas
- 👤 Steinemann Willy
- 👤 Kappeler Markus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:59
CPC Classifications
C; C09; C09B; C09B43/00; C09B43/12; Y; Y10; Y10S; Y10S534/00; Y10S534/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
A MEMBER SELECTED FROM THE CLASS CONSISTING OF AZO DYESTUFFS WHICH CORRESPOND TO THE FORMULA
Claim 2
Dependent Claim
15 words
A MEMBER SELECTED FROM THE CLASS CONSISTING OF AZO DYESTUFFS WHICH CORRESPOND TO THE FORMULA
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) | 1960-11-18 | 1961-05-20 | 1961-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-18 | 1965-05-20 | 1965-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-18 | 1969-05-20 | 1969-11-19 | $7700.00 | Window Closed / Lapsed |