Patent US2709168A successfully refreshed from Google Patents.
US2709168A
Expired / Lapsed
US
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Vat dyestuffs
Assignee: BASF Schweiz AG
•
Filing: 1951-01-25
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Granted: 1955-05-24
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Expires: 1971-01-25
Abstract
No abstract record available.
Inventors
- 👤 Jenny Walter
- 👤 Kern Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:52
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/36; C09B1/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
A VAT DYESTUFF OF THE GENERAL FORMULA
Claim 2
Dependent Claim
7 words
A VAT DYESTUFF OF THE GENERAL FORMULA
References Cited (Backward Citations)
US2029239A
Cited
US2356061A
Cited
US2430771A
Cited
US2586233A
Cited
US2543411A
Cited
US2506024A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-23 | 1958-11-22 | 1959-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-23 | 1962-11-22 | 1963-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-23 | 1966-11-22 | 1967-05-24 | $7700.00 | Window Closed / Lapsed |