Patent US3764384A successfully refreshed from Google Patents.
US3764384A
Expired / Lapsed
US
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Process for removing polyvinyl halide residues from processing equipment
Assignee: GAF Chemicals Corp
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Filing: 1970-07-24
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Granted: 1973-10-09
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Expires: 1990-07-24
Abstract
Abstract A PROCESS FOR REMOVING RESIDUES OF POLYMERIC MATERIALS PARTICULARLY VINYL HALIDE HOMOPOLYMERS FROM PROCESSING EQUIPMENT BY A SOLVENT CLEANING TECHNIQUE BASED UPON CONTACTING SUCH RESIDUES WITHIN THE EQUIPMENT WITH N-METHYL PYRROLIDONE AND THEREBY LOOSENING, SUSPENDING OR DISSOLVING SAME. THE CONTACTING OPERATION IS PREFERABLY BY MEANS OF A SPRAY APPLIED AT ELEVATED TEMPERATURES. PROVISION IS MADE FOR RECYCLING THE SOLVENT AND RECOVERING THE SOLVENT AND/OR THE POLYMERIC RESIDUES.
Inventors
- 👤 R Berni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:20
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/008
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |