US3490586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of working up coal tar pitch
Assignee: Schill and Seilacher Chemische Fabrik
•
Filing: 1966-08-22
•
Granted: 1970-01-20
•
Expires: 1986-08-22
Abstract
No abstract record available.
Inventors
- 👤 Leopold A Jaisle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:07
CPC Classifications
C; C10; C10C; C10C3/00; C10C3/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1275778A
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US1553641A
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US1355099A
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US1722872A
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US1726638A
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US2060447A
Cited
US2936282A
Cited
US2955079A
Cited
US3372045A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-19 | 1973-07-21 | 1974-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-19 | 1977-07-21 | 1978-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-19 | 1981-07-21 | 1982-01-20 | $7700.00 | Window Closed / Lapsed |