US3422179A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making thermoplastic welding fitting
Assignee: Sud-West-Chemie GmbH
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Filing: 1966-11-16
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Granted: 1969-01-14
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Expires: 1986-11-16
Abstract
No abstract record available.
Inventors
- 👤 Hans Bauer
- 👤 Helmut Holzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:17
CPC Classifications
B; B29; B29D; B29D23/00; B29D23/001; B29D23/003; B29D23/005; A; A47; A47L; A47L9/00; A47L9/24; A47L9/242; B29C; B29C45/00; B29C45/14; B29C45/14639; B29C65/00; B29C65/02; B29C65/34; B29C65/3404; B29C65/342; B29C65/3468; B29C65/3472; B29C65/3476; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/12; B29C66/122; B29C66/1222; B29C66/1224; B29C66/50; B29C66/51; B29C66/52; B29C66/522; B29C66/5221; B29C66/5229; B29C66/52291; B29C66/52292; B29C66/52298; F; F16; F16L; F16L47/00; F16L47/02; F16L47/03; B29C66/70; B29C66/71; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/4987; Y10T29/49881
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
190 words
A METHOD FOR MANUFACTURING A THERMOPLASTIC WELDING FITTING SLEEVE PROVIDED WITH AN ELECTRICALLY CONDUCTIVE HEATING ELEMENT ATTACHED AT ITS INNER WALL COMPRISING (A) WINDING AND ATTACHING A BIFILAR HEATING ELEMENT IN THE SCREW-THREADS OF A THIN-WALLED CARRIER TUBE OF THERMOPLASTIC MATERIAL HAVING SCREW-THREADS ON ITS OUTER SURFACE WHEREIN SAID ELEMENT IS LAID, (B) POSITIONING SAID CARRIER TUBE AND ELEMENT OVER A CORE OF AN INJECTION MOLD, (C) INJECTION MOLDING A SLEEVE OF THERMOPLASTIC MATERIAL AROUND SAID CARRIER TUBE AND ELEMENT WHEREBY SAID ELEMENT IS ATTACHED IN THE SLEEVE AT THE INTERFACE OF THE SLEEVE AND THE OUTER CARRIER TUBE WALL AND THE SLEEVE IS DETACHABLY UNITED WITH THE TUBE, THE THERMOPLASTIC MATERIAL OF SAID CARRIER TUBE ESSENTIALLY HAVING A SOFTENING POINT LOWER THAN THE SOFTENING POINT OF THE THERMOPLASTIC MATERIAL OF SAID SLEEVE, (D) HEATING SAID CARRIER TUBE TO A TEMPERATURE BELOW THE SOFTENING POINT OF SAID SLEEVE, BUT SUFFICIENTLY HIGH ENOUGH TO SOFTEN SAID CARRIER TUBE TO PERMIT IT TO BE REMOVED FROM SAID ELEMENT AND SLEEVE, AND (E) REMOVING SAID TUBE FROM SAID ELEMENT AND SLEEVE, WITHOUT DISPLACING OR DETACHING SAID ELEMENT FROM ITS POSITION IN SAID SLEEVE.
Claim 2
Independent Claim
190 words
A METHOD FOR MANUFACTURING A THERMOPLASTIC WELDING FITTING SLEEVE PROVIDED WITH AN ELECTRICALLY CONDUCTIVE HEATING ELEMENT ATTACHED AT ITS INNER WALL COMPRISING (A) WINDING AND ATTACHING A BIFILAR HEATING ELEMENT IN THE SCREW-THREADS OF A THIN-WALLED CARRIER TUBE OF THERMOPLASTIC MATERIAL HAVING SCREW-THREADS ON ITS OUTER SURFACE WHEREIN SAID ELEMENT IS LAID, (B) POSITIONING SAID CARRIER TUBE AND ELEMENT OVER A CORE OF AN INJECTION MOLD, (C) INJECTION MOLDING A SLEEVE OF THERMOPLASTIC MATERIAL AROUND SAID CARRIER TUBE AND ELEMENT WHEREBY SAID ELEMENT IS ATTACHED IN THE SLEEVE AT THE INTERFACE OF THE SLEEVE AND THE OUTER CARRIER TUBE WALL AND THE SLEEVE IS DETACHABLY UNITED WITH THE TUBE, THE THERMOPLASTIC MATERIAL OF SAID CARRIER TUBE ESSENTIALLY HAVING A SOFTENING POINT LOWER THAN THE SOFTENING POINT OF THE THERMOPLASTIC MATERIAL OF SAID SLEEVE, (D) HEATING SAID CARRIER TUBE TO A TEMPERATURE BELOW THE SOFTENING POINT OF SAID SLEEVE, BUT SUFFICIENTLY HIGH ENOUGH TO SOFTEN SAID CARRIER TUBE TO PERMIT IT TO BE REMOVED FROM SAID ELEMENT AND SLEEVE, AND (E) REMOVING SAID TUBE FROM SAID ELEMENT AND SLEEVE, WITHOUT DISPLACING OR DETACHING SAID ELEMENT FROM ITS POSITION IN SAID SLEEVE.
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) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |