US2833756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyazo dyestuffs
Assignee: Cassella Farbwerke Mainkur AG
•
Filing: 1955-04-27
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Granted: 1958-05-06
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Expires: 1975-04-27
Abstract
No abstract record available.
Inventors
- 👤 Fleischhauer Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:24
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/02; D06P3/04; D06P3/32; D06P3/3206; D06P3/3226; C; C09; C09B; C09B35/00; C09B35/38; C09B35/44; C09B35/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
POLYAZO DYESTUFFS OF THE GENERAL FORMULA
Claim 2
Dependent Claim
6 words
POLYAZO DYESTUFFS OF THE GENERAL FORMULA
References Cited (Backward Citations)
US717550A
Cited
US1885609A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-05 | 1961-11-04 | 1962-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-05 | 1965-11-04 | 1966-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-05 | 1969-11-04 | 1970-05-06 | $7700.00 | Window Closed / Lapsed |