US3515647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for distilling styrene and subjecting bottoms to thin film evaporation
Assignee: Universal Oil Products Co
•
Filing: 1968-12-06
•
Granted: 1970-06-02
•
Expires: 1988-12-06
Abstract
No abstract record available.
Inventors
- 👤 Harry M Van Tassell
- 👤 Wayne N Root
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:46
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; Y; Y10; Y10S; Y10S159/00; Y10S159/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2336493A
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US2556030A
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US2895886A
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US2905596A
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GB900457A
Cited
US3084108A
Cited
US2952675A
Cited
US3209044A
Cited
US3294856A
Cited
US3378467A
Cited
US3408264A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-01 | 1973-12-01 | 1974-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-01 | 1977-12-01 | 1978-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-01 | 1981-12-01 | 1982-06-02 | $7700.00 | Window Closed / Lapsed |