Patent US2768172A successfully refreshed from Google Patents.
US2768172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brown vat dyestuffs
Assignee: GAF Chemicals Corp
•
Filing: 1954-10-25
•
Granted: 1956-10-23
•
Expires: 1974-10-25
Abstract
No abstract record available.
Inventors
- 👤 Schmidt-Nickels Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:47
CPC Classifications
C; C09; C09B; C09B57/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
A DYESTUFF SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS HAVING THE FORMULA
Claim 2
Dependent Claim
12 words
A DYESTUFF SELECTED FROM THE GROUP CONSISTING OF 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) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |