US3729359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous tube sealer
Assignee: Wright Machinery Co Inc
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Filing: 1971-04-30
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Granted: 1973-04-24
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Expires: 1991-04-30
Abstract
Abstract A tube former directs a web of unsupported polyethylene film into tubular form about a cylindrical mandrel with its longitudinal edges overlapping. An endless belt of Teflon impregnated Fiberglas is trained over idler pulleys to a run along the overlapped edges and a heater device heats the belt and film to fuse the overlapped edges and cause them to adhere to each other and to the belt so that the belt is pulled along as the tube is drawn along the mandrel. Cooling means then cools the belt and film and one of the idler pulleys strips the belt from the sealed tube. The heater is moved to and from the belt under the control of the cooling means.
Inventors
- 👤 C Monsees
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:15
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C53/00; B29C53/36; B29C53/38; B29C53/48; B29C53/50; B29C66/00; B29C66/004; B29C66/0042; B29C66/005; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/432; B29C66/4322; B29C66/49; B29C66/70; B29C66/71; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/81; B29C66/814; B29C66/8145; B29C66/81457; B29C66/816; B29C66/8161; B29C66/8169; B29C66/818; B29C66/8181; B29C66/81811; B29C66/81812; B29C66/82; B29C66/822; B29C66/8221; B29C66/83; B29C66/834; B29C66/8341; B29C66/83421; B29C66/87; B29C66/874; B29C66/8744; B29C66/87443; B29C66/349; B29C66/812; B29C66/8122; B29C66/8223; B29C66/90; B29C66/92; B29C66/924; B29C66/9241; B29C66/9261; B29C66/92651; B29C66/92653
Claims Analysis
Total Claims: 0
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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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |