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US2750375A
Expired / Lapsed
US
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Polyazo-dyestuffs
Assignee: Hoechst AG
•
Filing: 1952-12-16
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Granted: 1956-06-12
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Expires: 1972-12-16
Abstract
No abstract record available.
Inventors
- 👤 Siebert Arthur
- 👤 Huss Richard
- 👤 Weissert Josef
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:41
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/02; D06P3/04; D06P3/32; D06P3/3206; D06P3/3226; C; C09; C09B; C09B33/00; C09B33/18; D06P3/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
POLY-AZO-DYESTUFFS CORRESPONDING TO THE FOLLOWING GENERAL FORMULA
Claim 2
Dependent Claim
7 words
POLY-AZO-DYESTUFFS CORRESPONDING TO THE FOLLOWING GENERAL 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) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |