US2880121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polypropylene process
Assignee: Sunoco Inc
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Filing: 1957-03-15
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Granted: 1959-03-31
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Expires: 1977-03-15
Abstract
No abstract record available.
Inventors
- 👤 William E Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:39
CPC Classifications
C; C09; C09D; C09D9/00; C08; C08F; C08F8/00; C08F8/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
PROCESS FOR REMOVING SOLID POLYPROPYLENE ADHERING TO APPARATUS WHICH COMPRISES CONTACTING THE ADHERING POLYPROPYLENE WITH OXYGEN AT AN ELEVATED TEMPERATURE, DISSOLVING THE SO-TREATED POLYPROPYLENE, IN AN ORGANIC SOLVENT HAVING A BOILING POINT ABOVE ABOUT 200*F., AND REMOVING THE RESULTING SOLUTION FROM THE APPARATUS.
Claim 2
Dependent Claim
43 words
PROCESS FOR REMOVING SOLID POLYPROPYLENE ADHERING TO APPARATUS WHICH COMPRISES CONTACTING THE ADHERING POLYPROPYLENE WITH OXYGEN AT AN ELEVATED TEMPERATURE, DISSOLVING THE SO-TREATED POLYPROPYLENE, IN AN ORGANIC SOLVENT HAVING A BOILING POINT ABOVE ABOUT 200*F., AND REMOVING THE RESULTING SOLUTION FROM THE APPARATUS.
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) | 1962-03-30 | 1962-09-29 | 1963-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-30 | 1966-09-29 | 1967-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-30 | 1970-09-29 | 1971-03-31 | $7700.00 | Window Closed / Lapsed |