US3530138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
3 - hydroxy - pyrid - 2 - thiones and 3-hydroxy-2-mercapto - pyridines and their ethers
Assignee: Norgas AS
•
Filing: 1967-05-12
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Granted: 1970-09-22
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Expires: 1987-05-12
Abstract
No abstract record available.
Inventors
- 👤 Kjell Undheim
- 👤 Vegard Nordal
- 👤 Knut Tjonneland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:39
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/62; C07D213/70; C07D213/63; C07D213/65; C07D213/71; C07D213/78; C07D213/79; C07D213/81; C07D513/00; C07D513/02; C07D513/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1753658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-21 | 1974-03-23 | 1974-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-21 | 1978-03-23 | 1978-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-21 | 1982-03-23 | 1982-09-22 | $7700.00 | Window Closed / Lapsed |