Patent US4950347A successfully refreshed from Google Patents.
US4950347A
Expired / Lapsed
US
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Method for welding thermoplastic resin
Assignee: Nissho Corp
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Filing: 1989-05-05
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Granted: 1990-08-21
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Expires: 2009-05-05
Abstract
Abstract A method of welding thermoplastic resin with a high frequency welder, comprising the step of: putting an exothermic object to generate heat and an adherend made of thermoplastic resin not to be molten when high frequency waves are applied, between electrodes of a high frequency welder and thereafter generating high frequency waves between the electrodes. The method of the present invention enables to weld thermoplastic resin having a low dielectric loss which can not be welded with a high frequency welder.
Inventors
- 👤 Hitoshi Futagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:23
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C65/04; B29C65/24; B29C65/30; B29C65/32; B29C65/34; B29C65/36; B29C65/3604; B29C65/48; B29C65/4805; B29C65/481; B29C65/4815; B29C65/50; B29C65/5057; B29C65/72; B29C65/82; B29C65/8207; B29C65/8246; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/50; B29C66/51; B29C66/53; B29C66/532; B29C66/5326; B29C66/53261; B29C66/53262; B29C66/70; B29C66/72; B29C66/73; B29C66/731; B29C66/7314; B29C66/73143; B29C66/739; B29C66/7392; B29C66/73921; B29C66/74; B29C66/80; B29C66/81; B29C66/812; B29C66/8126; B29C66/81262; B29C66/81263; B29C66/814; B29C66/8141; B29C66/81431; B29C66/83; B29C66/832; B29C66/8322; B29C65/3672; B29C65/3676; B29C66/71; B29C66/748; B29C66/7485; B29C66/7486; B29C66/8122; B29C66/81411; B29C66/81421; B29C66/81423; B29C66/83221; B29K; B29K2001/00; B29K2009/00; B29K2009/06; B29K2019/00; B29K2023/00; B29K2025/00; B29K2027/00; B29K2027/08; B29K2027/12; B29K2031/00; B29K2031/04; B29K2055/00; B29K2055/02; B29K2079/00; B29K2079/08; B29K2079/085; B29K2105/00; B29K2105/0085; B29K2311/00; B29K2311/10; B29K2711/00; B29K2711/12; B29K2995/00; B29K2995/0003; B29K2995/0006; B29L; B29L2031/00; B29L2031/712; B29L2031/7148
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
A method of manufacturing a medical bag formed by joining a medical bag, defined by thermoplastic resin sheets, with a tubular port wherein both said sheets and said port are made of a thermoplastic resin not capable of being molten by application of high frequency-wave energy, comprising the steps of: inserting a core mold for high frequency welding within the tubular port; inserting said tubular port between the sheets defining an opening into said bag; placing exothermic objects, which generate heat when applied with high frequency-wave energy selected from the group consisting of cardboard and cotton cloth, on the outer sides of said sheets; fitting the tubular port, the sheets and the exothermic objects between electrodes adapted to accommodate the shape of the tubular port, and for high frequency welding; welding sheets to the outside of the tubular port by applying high frequency-wave energy to the mold; and removing the exothermic objects from the medical bag after high frequency-wave energy is applied.
Claim 2
Independent Claim
162 words
A method of manufacturing a medical bag formed by joining a medical bag, defined by thermoplastic resin sheets, with a tubular port wherein both said sheets and said port are made of a thermoplastic resin not capable of being molten by application of high frequency-wave energy, comprising the steps of: inserting a core mold for high frequency welding within the tubular port; inserting said tubular port between the sheets defining an opening into said bag; placing exothermic objects, which generate heat when applied with high frequency-wave energy selected from the group consisting of cardboard and cotton cloth, on the outer sides of said sheets; fitting the tubular port, the sheets and the exothermic objects between electrodes adapted to accommodate the shape of the tubular port, and for high frequency welding; welding sheets to the outside of the tubular port by applying high frequency-wave energy to the mold; and removing the exothermic objects from the medical bag after high frequency-wave energy is applied.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-20 | 1994-02-19 | 1994-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-20 | 1998-02-19 | 1998-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-20 | 2002-02-19 | 2002-08-21 | $7700.00 | Window Closed / Lapsed |