US3256237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polypropylene stabilized with organic thiophosphites
Assignee: Sunoco Inc
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Filing: 1964-06-30
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Granted: 1966-06-14
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Expires: 1984-06-30
Abstract
No abstract record available.
Inventors
- 👤 John A Casey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:21
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/06; C08F297/08; C08K; C08K5/00; C08K5/49; C08K5/5398; Y; Y10; Y10S; Y10S8/00; Y10S8/09
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
54 words
A COMPOSITION OF MATTER COMPRISING A SOLID CRYSTALLINE POLYMER OF PROPYLENE AND A STABILIZING QUANTITY, EFFECTIVE TO INHIBIT DEGRADATION OF SAID POLYMER RESULTING FROM HEAT, OXIDATION, LIGHT AND MECHANICAL SHEAR, OF A MATERIAL HAVING THE GENERAL FORMULA (RS)3P, WHEREIN EACH R IS A HYDROCARBON RADICAL HAVING FROM ABOUT 6 TO ABOUT 20 CARBON ATOMS.
Claim 2
Dependent Claim
54 words
A COMPOSITION OF MATTER COMPRISING A SOLID CRYSTALLINE POLYMER OF PROPYLENE AND A STABILIZING QUANTITY, EFFECTIVE TO INHIBIT DEGRADATION OF SAID POLYMER RESULTING FROM HEAT, OXIDATION, LIGHT AND MECHANICAL SHEAR, OF A MATERIAL HAVING THE GENERAL FORMULA (RS)3P, WHEREIN EACH R IS A HYDROCARBON RADICAL HAVING FROM ABOUT 6 TO ABOUT 20 CARBON ATOMS.
Claim 3
Dependent Claim
22 words
THE COMPOSITION OF MATTER OF CLAIM 1 WHEREIN SAID STABILIZING QUANTITY IS IN THE RANGE BETWEEN ABOUT 0.005 AND 2% BY WEIGHT.
Claim 4
Dependent Claim
39 words
THE COMPOSITION OF MATTER OF CLAIM 2 FURTHER CHARACTERIZED IN THAT SAID COMPOSITION ADDITIONALLY CONTAINS 0.005% TO 2.0% BY WEIGHT OF A MATERIAL HAVING THE FORMULA: (RO)3P, WHEREIN R IS A HYDROCARBON RADICAL HAVING 6 TO 20 CARBON ATOMS.
Claim 5
Dependent Claim
58 words
THE COMPOSITION OF MATTER OF CLAIM 9 FURTHER CHARACTERIZED IN THAT SAID COMPOSITION ADDITIONALLY CONTAINS AT LEAST ONE STABILIZER SELECTED FROM THE GROUP CONSISTING OF SOAPS OF METALS FROM GROUPS II, III AND IV OF THE PERIODIC TABLE, EPOXY COMPOUNDS, AND POLYCARBOXYLIC ACIDS HAVING FROM TWO TO THREE CARBON ATOMS BETWEEN AT LEAST ONE PAIR OF CARBOXYL GROUPS.
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) | 1969-06-13 | 1969-12-13 | 1970-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-13 | 1973-12-13 | 1974-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-13 | 1977-12-13 | 1978-06-14 | $7700.00 | Window Closed / Lapsed |