Patent US2666757A successfully refreshed from Google Patents.
US2666757A
Expired / Lapsed
US
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Azo dyes for cellulosic fibers
Assignee: GAF Chemicals Corp
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Filing: 1950-06-28
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Granted: 1954-01-19
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Expires: 1970-06-28
Abstract
No abstract record available.
Inventors
- 👤 Richter Ludwig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:33
CPC Classifications
C; C09; C09B; C09B43/00; C09B43/12; C09B43/136; C09B43/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
PRODUCTS OF THE FOLLOWING CONSTITUTION:
Claim 2
Dependent Claim
5 words
PRODUCTS OF THE FOLLOWING CONSTITUTION:
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) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |