US3278987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single-shaft screw extruder for plastics
Assignee: Bayer AG
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Filing: 1964-03-31
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Granted: 1966-10-18
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Expires: 1984-03-31
Abstract
No abstract record available.
Inventors
- 👤 Rodenacker Wolf
- 👤 Wegner Heinz
- 👤 Klerx Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:57
CPC Classifications
B; B01; B01F; B01F35/00; B01F35/10; B01F35/145; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/395; B29C48/50; B29C48/68; B29C48/685; B29C48/687; B29C48/92; B30; B30B; B30B11/00; B30B11/22; B30B11/24; B30B11/248; B29C2948/00; B29C2948/92; B29C2948/92009; B29C2948/92019; B29C2948/92038; B29C2948/92323; B29C2948/92361; B29C2948/9238; B29C2948/9239; B29C2948/92504; B29C2948/92514; B29C2948/92533; B29C2948/9258; B29C2948/926; B29C2948/92819; B29C2948/92857; B29C2948/92866; B29C48/03; B29C48/05; B29C48/06; B29C48/07; B29C48/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
AN APPARATUS FOR EXTENDING THERMOPLASTIC MATERIALS WHICH COMPRISES A HOUSING HAVING AN INLET DISPOSED FOR RECEIVING THERMOPLASTIC MATERIAL AND AN OUTLET FOR EXTRUDING SAID THERMOPLASTIC MATERIAL THEREFROM, A WORM MEMBER DISPOSED WIITHIN SAID HOUSING FOR ROTATION RELATIVE THERETO FOR CONVEYING SAID MATERIAL FROM THE INLET TO THE SION THROUGH SAID OUTLET, MEANS DEFINING A RACEWAY WITHIN SION THROUGH SAID OUTLET, MEANS DEFINING A RACEWAY WITHIN SAID HOUSING HAVING AN OPEN LENGTH PORTION DISPOSED IN TANGENTIAL RELATION TO SAID WORM MEMBER AND A CONTINUOUS TRAIN OF WIPER MEMBERS DISPOSED FOR OPERATIVE ENGAGEMENT WITH SAIID WORM MEMBER IN SUCCESSION FOR RECIRCULATING MOVEMENT THEREBY RELATIVE TO SAID HOUSNG ALONG A CLOSED CIRCUIT PATH DEFINED BY SAID RACEWAY, SAID WIPER MEMBERS BEING DISPOSED TO PASS IN SUCCESSION ALING THE OPEN LENGTH PORTION OF SAID RACEWAY IN WIPING CONTACT ENGAGEMENT WITH AT LEAST ONE THREAD OF SAID WORM MEMBER TO DEFINE A FLUID PRESSURE SEAL THEREAT FOR BLOCKING REVERSE FLOW OF THERMOPLASTIC MATERIAL CONVEYED UNDER COMPRESSION BY SAID WORM MEMBER.
Claim 2
Independent Claim
165 words
AN APPARATUS FOR EXTENDING THERMOPLASTIC MATERIALS WHICH COMPRISES A HOUSING HAVING AN INLET DISPOSED FOR RECEIVING THERMOPLASTIC MATERIAL AND AN OUTLET FOR EXTRUDING SAID THERMOPLASTIC MATERIAL THEREFROM, A WORM MEMBER DISPOSED WIITHIN SAID HOUSING FOR ROTATION RELATIVE THERETO FOR CONVEYING SAID MATERIAL FROM THE INLET TO THE SION THROUGH SAID OUTLET, MEANS DEFINING A RACEWAY WITHIN SION THROUGH SAID OUTLET, MEANS DEFINING A RACEWAY WITHIN SAID HOUSING HAVING AN OPEN LENGTH PORTION DISPOSED IN TANGENTIAL RELATION TO SAID WORM MEMBER AND A CONTINUOUS TRAIN OF WIPER MEMBERS DISPOSED FOR OPERATIVE ENGAGEMENT WITH SAIID WORM MEMBER IN SUCCESSION FOR RECIRCULATING MOVEMENT THEREBY RELATIVE TO SAID HOUSNG ALONG A CLOSED CIRCUIT PATH DEFINED BY SAID RACEWAY, SAID WIPER MEMBERS BEING DISPOSED TO PASS IN SUCCESSION ALING THE OPEN LENGTH PORTION OF SAID RACEWAY IN WIPING CONTACT ENGAGEMENT WITH AT LEAST ONE THREAD OF SAID WORM MEMBER TO DEFINE A FLUID PRESSURE SEAL THEREAT FOR BLOCKING REVERSE FLOW OF THERMOPLASTIC MATERIAL CONVEYED UNDER COMPRESSION BY SAID WORM MEMBER.
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) | 1969-10-17 | 1970-04-18 | 1970-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-17 | 1974-04-18 | 1974-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-17 | 1978-04-18 | 1978-10-18 | $7700.00 | Window Closed / Lapsed |