Patent US2772274A successfully refreshed from Google Patents.
US2772274A
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Heterocyclic vat dyestuffs
Assignee: GAF Chemicals Corp
•
Filing: 1954-12-28
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Granted: 1956-11-27
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Expires: 1974-12-28
Abstract
No abstract record available.
Inventors
- 👤 Schmidt-Nickels Wilhelm
- 👤 Lewis J Lugg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:27
CPC Classifications
C; C07; C07D; C07D471/00; C07D471/02; C07D471/04; C09; C09B; C09B57/00; C09B57/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
A DYESTUFF HAVING THE FORMULA
Claim 2
Dependent Claim
5 words
A DYESTUFF HAVING THE FORMULA
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-27 | 1960-05-28 | 1960-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-27 | 1964-05-28 | 1964-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-27 | 1968-05-28 | 1968-11-27 | $7700.00 | Window Closed / Lapsed |