Patent US2135293A successfully refreshed from Google Patents.
US2135293A
Expired / Lapsed
US
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Medicinal azo dyes
Assignee: Pyridium Corp
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Filing: 1936-08-20
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Granted: 1938-11-01
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Expires: 1956-08-20
Abstract
No abstract record available.
Inventors
- 👤 Raemer R Renshaw
- 👤 Edmond T Tisza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:55
CPC Classifications
C; C09; C09B; C09B29/00; C09B29/0025; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/72; C07D213/76; C09B29/34; C09B29/36; C09B29/3604; C09B29/3617
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) | 1941-10-31 | 1942-05-02 | 1942-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-10-31 | 1946-05-02 | 1946-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-10-31 | 1950-05-02 | 1950-11-01 | $7700.00 | Window Closed / Lapsed |