Patent US3039993A successfully refreshed from Google Patents.
US3039993A
Expired / Lapsed
US
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Polyethylene stabilizers
Assignee: Weston Chemical Corp
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Filing: 1960-05-10
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Granted: 1962-06-19
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Expires: 1980-05-10
Abstract
No abstract record available.
Inventors
- 👤 Friedman Lester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:52
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/524; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/141; C07F9/547; C07F9/6564; C07F9/6571; C07F9/6574; C08K5/5398
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
104 words
A SOLID POLYMER OF AN OLEFIN HAVING 2 TO 3 CARBON ATOMS STABILIZED WITH A MIXTURE OF HETEROCYCLIC PHOSPHITE WHICH IS A 1,3,2-DIOXAPHOSPHORINANE HAVING UP TO THREE LOWER ALKYL GROUPS ATTACHED TO CARBON ATOMS OF THE DIOXAPHOSPHORINANE RING AND HAVING THE FREE VALENCES OF THE PHOSPHORUS ATTACHED TO A CHALCOGEN OF ATOMIC WEIGHT 16 TO 32 WHICH IN TURN IS ATTACHED TO A HYDROCARBON GROUP FREE OF NONBENZENOID UNSATURATED AND A PHENOLIC ANTIOXIDANT SELECTED FROM THE GROUP CONSISTING OF HYDROCARBON SUBSTITUTED PHENOLS HAVING A TOTAL OF 4 TO 24 CARBON ATOMS IN THE HYDROCARBON SUBSTITUENTS, 2,2''-METHYLENE BIS-4,6-DIALKYL PHENOLS, 2,2''-BIS-(P-HYDROXYPHENYL) PROPANE AND 2,2'' THIOBIS-4,6-DIALKYL PHENOLS.
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) | 1965-06-18 | 1965-12-18 | 1966-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-18 | 1969-12-18 | 1970-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-18 | 1973-12-18 | 1974-06-19 | $7700.00 | Window Closed / Lapsed |