Patent US2893998A successfully refreshed from Google Patents.
US2893998A
Expired / Lapsed
US
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Anthraquinone vat dyes
Assignee: EIDP Inc
•
Filing: 1958-05-20
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Granted: 1959-07-07
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Expires: 1978-05-20
Abstract
No abstract record available.
Inventors
- 👤 Sartori Mario Francesco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:30
CPC Classifications
C; C09; C09B; C09B5/00; C09B5/24; C09B5/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
A VAT DYE BEING A MIXTURE OF THE TWO ISOMERIC COMPOUNDS OF THE FORMULAS
Claim 2
Dependent Claim
14 words
A VAT DYE BEING A MIXTURE OF THE TWO ISOMERIC COMPOUNDS OF THE FORMULAS
References Cited (Backward Citations)
US2459424A
Cited
US2473950A
Cited
US2473949A
Cited
US2407704A
Cited
US2768172A
Cited
US2813875A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-06 | 1963-01-05 | 1963-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-06 | 1967-01-05 | 1967-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-06 | 1971-01-05 | 1971-07-07 | $7700.00 | Window Closed / Lapsed |