US2668815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vat dyestuffs of the perylenetetracarboxylic acid bis-arylimide series
Assignee: GAF Chemicals Corp
•
Filing: 1951-05-24
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Granted: 1954-02-09
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Expires: 1971-05-24
Abstract
No abstract record available.
Inventors
- 👤 Nawiasky Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:45
CPC Classifications
C; C09; C09B; C09B5/00; C09B5/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
A VAT DYE HAVING THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
8 words
A VAT DYE HAVING THE FOLLOWING GENERAL FORMULA:
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-08 | 1957-08-10 | 1958-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-08 | 1961-08-10 | 1962-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-08 | 1965-08-10 | 1966-02-09 | $7700.00 | Window Closed / Lapsed |