Patent US2863875A successfully refreshed from Google Patents.
US2863875A
Expired / Lapsed
US
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Process for the production of basic dyestuffs
Assignee: Bayer AG
•
Filing: 1954-12-16
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Granted: 1958-12-09
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Expires: 1974-12-16
Abstract
No abstract record available.
Inventors
- 👤 Bienert Berthold
- 👤 Baumann Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:38
CPC Classifications
C; C09; C09B; C09B47/00; C09B47/04; C09B47/08; C09B47/12; C09B1/00; C09B1/16; C09B1/20; C09B19/00; C09B19/02; C09B43/00; C09B47/24; C09B47/26; C09B62/00; C09B62/44; C09B62/62; C09B69/00; C09B69/001
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
A PROCESS FOR THE PRODUCTION OF A DYESTUFF OF THE GENERAL FORMULA
Claim 2
Dependent Claim
12 words
A PROCESS FOR THE PRODUCTION OF A DYESTUFF OF THE GENERAL FORMULA
References Cited (Backward Citations)
GB520199A
Cited
US2285359A
Cited
US2414050A
Cited
US2416387A
Cited
US2542328A
Cited
US2479491A
Cited
GB614407A
Cited
US2744914A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-08 | 1962-06-09 | 1962-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-08 | 1966-06-09 | 1966-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-08 | 1970-06-09 | 1970-12-09 | $7700.00 | Window Closed / Lapsed |