Patent US2779696A successfully refreshed from Google Patents.
US2779696A
Expired / Lapsed
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Method of cleaning extruders
Assignee: AT&T Inc
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Filing: 1954-03-04
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Granted: 1957-01-29
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Expires: 1974-03-04
Abstract
No abstract record available.
Inventors
- 👤 Jr Albert D Rutherford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:03
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/1753; B29C48/00; B29C48/03; B29C48/05; B29C48/25; B29C48/27; B29C48/36; B29C48/395
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
THE METHOD OF CLEANING THE INTERIOR OF PLASTICS EXTRUDERS, WHICH COMPRISES INTRODUCING INTO SUCH AN EXTRUDER WATER AND A GRANULAR PLASTIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF POLYVINYUL CHLORIDE AND POLYETHYLENE, FORCING THROUGH THE EXTRUDER A SUFFICIENT QUANTITY OF THE PLASTIC COMPOUND AND THE WATER TO CLEAN THE INTERIOR THEREOF, AND MAINTAINING THE EXTERIOR AT SUCH A TEMPERATURE THAT THE PLASTIC FORCED THERETHROUGH IS IN EXTRUDABLE CONDITION AND THE WATER IS CONVERTED INTO STEAM.
Claim 2
Independent Claim
75 words
THE METHOD OF CLEANING THE INTERIOR OF PLASTICS EXTRUDERS, WHICH COMPRISES INTRODUCING INTO SUCH AN EXTRUDER WATER AND A GRANULAR PLASTIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF POLYVINYUL CHLORIDE AND POLYETHYLENE, FORCING THROUGH THE EXTRUDER A SUFFICIENT QUANTITY OF THE PLASTIC COMPOUND AND THE WATER TO CLEAN THE INTERIOR THEREOF, AND MAINTAINING THE EXTERIOR AT SUCH A TEMPERATURE THAT THE PLASTIC FORCED THERETHROUGH IS IN EXTRUDABLE CONDITION AND THE WATER IS CONVERTED INTO STEAM.
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) | 1960-01-29 | 1960-07-30 | 1961-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-29 | 1964-07-30 | 1965-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-29 | 1968-07-30 | 1969-01-29 | $7700.00 | Window Closed / Lapsed |