US2813856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azo dyestuffs
Assignee: Saul and Co
•
Filing: 1953-04-20
•
Granted: 1957-11-19
•
Expires: 1973-04-20
Abstract
No abstract record available.
Inventors
- 👤 Steinemann Willy
- 👤 Wehrli Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:14
CPC Classifications
C; C09; C09B; C09B43/00; C09B43/12; C09B45/00; C09B45/38; C09B45/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
AN AZO DYESTUFF CORRESPONDING TO THE FORMULA
Claim 2
Dependent Claim
7 words
AN AZO DYESTUFF CORRESPONDING 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 |