US3744530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer-handling process
Assignee: Phillips Petroleum Co
•
Filing: 1971-02-19
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Granted: 1973-07-10
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Expires: 1991-02-19
Abstract
Abstract Polyphenylene sulfide coated pipe is employed in the conduit system of a polymerization process. The method of coating the pipe is also disclosed.
Inventors
- 👤 R Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:38
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/02; C08G75/0204; C08G75/0209; C09; C09D; C09D181/00; C09D181/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |