US3597444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of synthesizing selenoureas from thioureas
Assignee: United States Department of the Army
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Filing: 1969-04-02
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Granted: 1971-08-03
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Expires: 1989-04-02
Abstract
Abstract THIS INVENTION RELATES TO THE PREPARATION OF SELENOUREAS HAVING EITHER ALIPHATIC OR AROMATIC SUBSTITUENTS BY DISPLACEMENT OF THE THIOMETHYL MOIETY FROM S-METHYLTHIOPSEUDOUREAS BY HYDROSELENIDE IONS IN SOLUTIONS HAVING A PH OF 8 TO 9. THIS METHOD PROVIDES YIELDS OF SUBSTITUTED SELENOUREAS BY HYDROSELENIDE IONS IN SOLUTIONS HAVING A ARE USEFUL IN SYNTHESIZING A WIDE VARIETY OF SELENO SUBSTITUTED COMPOUNDS, FOR EXAMPLE THE SELENO SUBSTITUTED STEROIDS OF U.S. PAT. NO. 3.372,173.
Inventors
- 👤 Daniel L Klayman
- 👤 Robert J Shine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:48
CPC Classifications
C; C07; C07C; C07C391/00
Claims Analysis
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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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |