US2820775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized polyethylene compositions
Assignee: Dow Chemical Co
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Filing: 1955-11-10
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Granted: 1958-01-21
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Expires: 1975-11-10
Abstract
No abstract record available.
Inventors
- 👤 Chamberlain Malcolm
- 👤 Raymond H Rigterink
- 👤 Jr Charles L Stacy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:43
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A POLYETHYLENE COMPOSITION STABILIZED TO THERMAL OXIDATION WHICH COMPRISES POLYETHYLENE AND BETWEEN ABOUT 0.0005 AND 2.0 PERCENT BY WEIGHT OF AN ANTIOXIDANT MATERIAL WHICH IS A MEMBER OF THE 4,4''-METHYLENE-BIS(2,6-DIALKYL PHENOL) CLASS OF COMPOUNDS HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
38 words
A POLYETHYLENE COMPOSITION STABILIZED TO THERMAL OXIDATION WHICH COMPRISES POLYETHYLENE AND BETWEEN ABOUT 0.0005 AND 2.0 PERCENT BY WEIGHT OF AN ANTIOXIDANT MATERIAL WHICH IS A MEMBER OF THE 4,4''-METHYLENE-BIS(2,6-DIALKYL PHENOL) CLASS OF COMPOUNDS HAVING THE GENERAL FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |