US1835841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulphuro-anhydride compounds of pyridines bases
Assignee: Scottish Dyes Ltd
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Filing: 1928-02-25
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Granted: 1931-12-08
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Expires: 1948-02-25
Abstract
No abstract record available.
Inventors
- 👤 Beckett Ernest George
- 👤 Harris John Edmund Guy
- 👤 Wylam Birkett
- 👤 Thomas John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:07
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/89
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) | 1934-12-07 | 1935-06-08 | 1935-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-12-07 | 1939-06-08 | 1939-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-12-07 | 1943-06-08 | 1943-12-08 | $7700.00 | Window Closed / Lapsed |