US3119720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyolefin removal method
Assignee: Millennium Petrochemicals Inc
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Filing: 1962-06-21
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Granted: 1964-01-28
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Expires: 1982-06-21
Abstract
No abstract record available.
Inventors
- 👤 Claude J Stiles
- 👤 James W Biggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:08
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/27; B29C48/03
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
184 words
A METHOD OF REMOVING CONTAMINATING SUBSTANCES FROM THE METAL SURFACES OF MOLTEN POLYOLEFIN PROCESSING EQUIPMENT COMPRISING THE STEPS OF: (A) CONTACTING SAID SURFACES WITH A MIXTURE COMPRISING FROM ABOUT 70 TO ABOUT 75 WEIGHT PERCENT OF A POLYOLEFIN AND FROM ABOUT 25 TO ABOUT 30 WEIGHT PERCENT OF PENTAERYTHRITOL AT A TEMPERATURE ABOVE THE SOFTENING POINT OF THE POLYOLEFIN AND BELOW THE MELTING POINT OF PENTAERYTHRITOL AND WITHDRAWING SAID MIXTURE FROM SAID SURFACES; (B) CONTACTING SAID SURFACES WITH A MIXTURE COMPRISING IN COMBINATION (1) A MAJOR PORTION OF THE POLYOLEFIN, (2) A MINOR PORTION OF AN ALKALI FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE, SODIUM CARBONATE, POTASSIUM, HYDROXIDE, POTASSIUM CARBONATE, AND MIXTURES THEREOF, AND (3) A MINOR PROTION OF A SEQUESTERING AGENT AT A TEMPERATURE ABOVE THE SOFTENING POINT OF THE POLYOLEFIN AND BELOW THE MELTING POINT THE PENTAERYTHRITOL AND WITHDRAWING SAID MIXTURE FROM SAID SURFACES; (C) CONTACTING SAID SURFACES WITH A MIXTURE CONSISTING OF A MAJOR PORTION OF THE POLYOLEFIN AND A MINOR PORTION OF WATER AT A TEMPERATURE ABOVE THE SOFTENING POINT OF THE POLYOLEFIN AND WITHDRAWING SAID MIXTURE FROM SAID SURFACES.
Claim 2
Independent Claim
184 words
A METHOD OF REMOVING CONTAMINATING SUBSTANCES FROM THE METAL SURFACES OF MOLTEN POLYOLEFIN PROCESSING EQUIPMENT COMPRISING THE STEPS OF: (A) CONTACTING SAID SURFACES WITH A MIXTURE COMPRISING FROM ABOUT 70 TO ABOUT 75 WEIGHT PERCENT OF A POLYOLEFIN AND FROM ABOUT 25 TO ABOUT 30 WEIGHT PERCENT OF PENTAERYTHRITOL AT A TEMPERATURE ABOVE THE SOFTENING POINT OF THE POLYOLEFIN AND BELOW THE MELTING POINT OF PENTAERYTHRITOL AND WITHDRAWING SAID MIXTURE FROM SAID SURFACES; (B) CONTACTING SAID SURFACES WITH A MIXTURE COMPRISING IN COMBINATION (1) A MAJOR PORTION OF THE POLYOLEFIN, (2) A MINOR PORTION OF AN ALKALI FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE, SODIUM CARBONATE, POTASSIUM, HYDROXIDE, POTASSIUM CARBONATE, AND MIXTURES THEREOF, AND (3) A MINOR PROTION OF A SEQUESTERING AGENT AT A TEMPERATURE ABOVE THE SOFTENING POINT OF THE POLYOLEFIN AND BELOW THE MELTING POINT THE PENTAERYTHRITOL AND WITHDRAWING SAID MIXTURE FROM SAID SURFACES; (C) CONTACTING SAID SURFACES WITH A MIXTURE CONSISTING OF A MAJOR PORTION OF THE POLYOLEFIN AND A MINOR PORTION OF WATER AT A TEMPERATURE ABOVE THE SOFTENING POINT OF THE POLYOLEFIN AND WITHDRAWING SAID MIXTURE FROM SAID SURFACES.
Claim 3
Dependent Claim
87 words
A COMPOSITION OF MATTER FOR REMOVING ADHERED PENTAERYTHRITOL, OXIDIZED POLYOLEFIN RESIN, AND METALLIC OXIDES FROM THE METAL SURFACES OF MOLTEN POLYOLEFIN PROCESSING EQUIPMENT COMPRISING IN COMBINATION A MIXTURE OF: (A) A MAJOR AMOUNT OF AT LEAST 85 WEIGHT PRECENT OF A THERMOPLASTIC POLYOLEFIN RESIN; (B) A MINOR AMOUNT OF AT LEAST 4 WEIGHT PERCENT OF AN ALKALI FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE, SODIUM CARBONATE, POTASSIUM HYDROXIDE, POTASSIUM CARBONATE, AND MIXTURES THEREOF; (C) A MINOR AMOUNT OF AT LEAST 0.75 WEIGHT PERCENT OF A SEQUESTERING AGENT.
Claim 4
Dependent Claim
87 words
A COMPOSITION OF MATTER FOR REMOVING ADHERED PENTAERYTHRITOL, OXIDIZED POLYOLEFIN RESIN, AND METALLIC OXIDES FROM THE METAL SURFACES OF MOLTEN POLYOLEFIN PROCESSING EQUIPMENT COMPRISING IN COMBINATION A MIXTURE OF: (A) A MAJOR AMOUNT OF AT LEAST 85 WEIGHT PRECENT OF A THERMOPLASTIC POLYOLEFIN RESIN; (B) A MINOR AMOUNT OF AT LEAST 4 WEIGHT PERCENT OF AN ALKALI FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE, SODIUM CARBONATE, POTASSIUM HYDROXIDE, POTASSIUM CARBONATE, AND MIXTURES THEREOF; (C) A MINOR AMOUNT OF AT LEAST 0.75 WEIGHT PERCENT OF A SEQUESTERING AGENT.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-01-27 | 1967-07-29 | 1968-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-27 | 1971-07-29 | 1972-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-27 | 1975-07-29 | 1976-01-28 | $7700.00 | Window Closed / Lapsed |