US3218292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of polyethylene with calcium silicate and an amine or phenol
Assignee: Monsanto Co
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Filing: 1961-12-29
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Granted: 1965-11-16
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Expires: 1981-12-29
Abstract
No abstract record available.
Inventors
- 👤 Shaffer E Horne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:24
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A COMPOSITION COMPRISING A NORMALLY SOLID POLYMER OF ETHYLENE, FROM 5 PARTS PER MILLION TO 5,000 PARTS PER MILLION OF AN ANTIOXIDANT FOR POLYETHYLENE SELECTED FROM THE GROUP CONSISTING OF DIALKYL SULFIDES, HINDERED PHENOLS AND SECONDARY AROMATIC AMINES AND FROM 0.01 WEIGHT PERCENT TO ABOUT 1 WEIGHT PERCENT OF THE POLYMER OF A FINELY DIVIDED CALCIUM SILICATE.
Claim 2
Dependent Claim
57 words
A COMPOSITION COMPRISING A NORMALLY SOLID POLYMER OF ETHYLENE, FROM 5 PARTS PER MILLION TO 5,000 PARTS PER MILLION OF AN ANTIOXIDANT FOR POLYETHYLENE SELECTED FROM THE GROUP CONSISTING OF DIALKYL SULFIDES, HINDERED PHENOLS AND SECONDARY AROMATIC AMINES AND FROM 0.01 WEIGHT PERCENT TO ABOUT 1 WEIGHT PERCENT OF THE POLYMER OF A FINELY DIVIDED CALCIUM SILICATE.
References Cited (Backward Citations)
US2985617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |