US3368930A
Expired / Lapsed
US
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Method and apparatus for forming tubes of thermoplastic film
Assignee: Phillips Petroleum Co
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Filing: 1964-10-16
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Granted: 1968-02-13
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Expires: 1984-10-16
Abstract
No abstract record available.
Inventors
- 👤 Elmer C Beason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:47
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/01; B29C66/03; B29C66/034; B29C66/0342; B29C65/00; B29C65/02; B29C65/18; B29C65/22; B29C65/221; B29C65/222; B29C65/228; B29C65/74; B29C65/743; B29C65/7439; B29C65/78; B29C65/7858; B29C65/7888; B29C65/7894; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/13; B29C66/137; B29C66/40; B29C66/41; B29C66/43; B29C66/432; B29C66/4322; B29C66/70; B29C66/71; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/81; B29C66/812; B29C66/8126; B29C66/81261; B29C66/814; B29C66/8141; B29C66/81431; B29C66/83; B29C66/834; B29C66/8341; B29C66/83411; B29C66/83413; B29C66/836; B29C66/84; B29C66/843; B29C66/8432; B29C66/114; B29C66/1142; B29C66/83415; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1054; Y10T156/12; Y10T156/1313
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
138 words
A METHOD OF CONTINUOUSLY FORMING AT LEAST ONE THINWALLED TAUBE OF A HEAT-FUSIBLE AND HEAT-SEALABLE THERMOPLASTIC MATERIAL SUCH A POLYETHYLENE FROM A CONTINUOUS TRAVELING WEB HAVING TWO LAYERS ADJACENT AND PARALLEL TO ONE ANOTHER WHICH COMPRISES: ADVANCING SAID THERMOPLASTIC MATERIAL PAST A HEATING ELEMENT AT 1500-2000* F. SO THAT SAID HEATING ELEMENT IS PROTRUDED THROUGH SAID CONTINUOUSLY ADVANCING LAYERS, HEATING AND SEVERING THEM ALONG A PATH ESSENTIALLY PARALLEL TO THE DIRECTION OF TRAVEL OF SAID ADVANCING LAYERS IN SUCH A MANNER THAT THE HEATED AND SEVERED EDGES ARE FUSED TOGETHER TO FORM A CLEAN, STRONG, CONTINUOUS JOINT WHEN COOLED, SAID ADVANCING WEB BEING PASSED OVER DAID HEATING ELEMENT IN A TANGENTIAL RELATIONSHIP TO SAID HEATING ELEMENT SUCH THAT THE AREA OF CONTACT BETWEEN SAID ADVANCING WEB AND SAID HEATING ELEMENT IS OVER A LENGTH OF SAID HEATING ELEMENT.
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) | 1971-02-12 | 1971-08-14 | 1972-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-12 | 1975-08-14 | 1976-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-12 | 1979-08-14 | 1980-02-13 | $7700.00 | Window Closed / Lapsed |