US3000857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat and light stabilization of solid polypropylene
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1959-10-26
•
Granted: 1961-09-19
•
Expires: 1979-10-26
Abstract
No abstract record available.
Inventors
- 👤 William J Craven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:37
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08K5/132
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
36 words
A COMPOSITION OF MATTER COMPRISING A SOLID POLYPROPYLENE, LOW PRESSURE POLYMER PREPARED BY UTILIZING A PARTIALLY REDUCED, HEAVY, TRANSITION METAL HALIDE CATALYST, ADMIXED WITH A SYNERGISTIC COMBINATION OF A MINOR AMOUNT OF BOTH DI-T-BUTYL-P-CRESOL AND 2,2''-DIHYDROXY-4OCTOXYBENZOPHENONE.
References Cited (Backward Citations)
US2852488A
Cited
US2853521A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |