US3549609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Series-parallel cis polybutadiene reactor trains
Assignee: Phillips Petroleum Co
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Filing: 1968-12-16
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Granted: 1970-12-22
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Expires: 1988-12-16
Abstract
No abstract record available.
Inventors
- 👤 Donald D Norwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:00
CPC Classifications
C; C08; C08F; C08F136/00; C08F136/02; C08F136/04; C08F136/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2443817A
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US2663699A
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US2658054A
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US2825721A
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US2872438A
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US3178402A
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US3057840A
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US3035040A
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US3182052A
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US3189592A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-21 | 1974-06-22 | 1974-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-21 | 1978-06-22 | 1978-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-21 | 1982-06-22 | 1982-12-22 | $7700.00 | Window Closed / Lapsed |