Patent US3147283A successfully refreshed from Google Patents.
US3147283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
New dyestuffs of the naphthofurandione series
Assignee: BASF Schweiz AG
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Filing: 1962-08-07
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Granted: 1964-09-01
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Expires: 1982-08-07
Abstract
No abstract record available.
Inventors
- 👤 Frey Christoph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:22
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/92; C09; C09B; C09B57/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
9 words
A DYESTUFF OF THE NAPHTHOFURANDIONE SERIES OF THE FORMULA
Claim 2
Dependent Claim
9 words
A DYESTUFF OF THE NAPHTHOFURANDIONE SERIES OF THE FORMULA
Claim 3
Dependent Claim
9 words
A DYESTUFF OF THE NAPHTHOFURANDIONE SERIES OF THE FORMULA
Claim 4
Dependent Claim
9 words
A DYESTUFF OF THE NAPHTHOFURANDIONE SERIES OF 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) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |