Patent US2186389A successfully refreshed from Google Patents.
US2186389A
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US
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Vat dyestuffs and their leuco esters
Assignee: General Aniline Works Inc
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Filing: 1938-08-30
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Granted: 1940-01-09
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Expires: 1958-08-30
Abstract
No abstract record available.
Inventors
- 👤 Neresheimer Heinrich
- 👤 Honold Ernst
- 👤 Stein Berthold
- 👤 Schubert Max
- 👤 Anton Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:33
CPC Classifications
C; C09; C09B; C09B27/00; C09B43/00; C09B56/00; C09B56/12
Claims Analysis
Total Claims: 0
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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) | 1943-01-08 | 1943-07-10 | 1944-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-01-08 | 1947-07-10 | 1948-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-01-08 | 1951-07-10 | 1952-01-09 | $7700.00 | Window Closed / Lapsed |