Patent US3485812A successfully refreshed from Google Patents.
US3485812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processes for preparing ethylene polymers
Assignee: Gulf Research and Development Co
•
Filing: 1966-08-30
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Granted: 1969-12-23
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Expires: 1986-08-30
Abstract
No abstract record available.
Inventors
- 👤 Harry D Anspon
- 👤 Francis E Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:58
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2893985A
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US2956982A
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US2999856A
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US3334081A
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US3119804A
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US3317504A
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US3090778A
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US3274167A
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US3377330A
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US3349072A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-22 | 1973-06-23 | 1973-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-22 | 1977-06-23 | 1977-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-22 | 1981-06-23 | 1981-12-23 | $7700.00 | Window Closed / Lapsed |