Patent US2862931A successfully refreshed from Google Patents.
US2862931A
Expired / Lapsed
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Heterocyclic vat dyestuffs
Assignee: GAF Chemicals Corp
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Filing: 1955-12-30
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Granted: 1958-12-02
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Expires: 1975-12-30
Abstract
No abstract record available.
Inventors
- 👤 Schmidt-Nickels Wilhelm
- 👤 David I Randall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:46
CPC Classifications
C; C09; C09B; C09B3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
4 words
COMPOUNDS HAVING THE FORMULA
Claim 2
Dependent Claim
4 words
COMPOUNDS 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) | 1961-12-01 | 1962-06-02 | 1962-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-01 | 1966-06-02 | 1966-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-01 | 1970-06-02 | 1970-12-02 | $7700.00 | Window Closed / Lapsed |