US5128092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for shaping tetrafluoroethylene resin pipe
Assignee: Daikin Industries Ltd
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Filing: 1991-06-21
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Granted: 1992-07-07
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Expires: 2011-06-21
Abstract
Abstract A method for shaping a tetrafluoroethylene resin pipe which comprises: (a) winding a porous sheet of tetrafluoroethylene resin which is not sintered around a mandrel, (b) covering the wound sheet with an elastomeric material, (c) isotactically pressing the wound sheet covered with the elastomeric material, (d) removing the elastomeric material from the wound sheet, and (e) sintering the wound sheet. According to the present invention, a dense tetrafluoroethylene resin pipe having excellent appearance and surface smoothness can be easily obtained, while maintaining the advantages inherent in the conventional winding methods.
Inventors
- 👤 Hiroshi Asaumi
- 👤 Takehiro Yoshida
- 👤 Yasuo Yoda
- 👤 Tomokazu Hattori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:08
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/02; B29C43/027; B29C43/10; B29C43/12; B29C43/32; B29C43/36; B29C43/3642; B29C53/00; B29C53/56; B29C53/58; B29C53/581; B29C67/00; B29C67/02; B29C67/04; B29C2043/3205; B29C2043/3238; B29C43/006; B29K; B29K2027/00; B29K2027/12; B29K2027/18; B29K2105/00; B29K2105/25; B29K2105/253; B29K2105/256; B29K2105/258; B29L; B29L2023/00; B29L2023/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
60 words
A method for shaping a tetrafluoroethylene resin pipe which comprises: (a) winding a porous sheet of tetrafluoroethylene resin which is not sintered around a mandrel, (b) covering the wound sheet with an elastomeric material, (c) isotactically pressing the wound sheet covered with the elastomeric material, (d) removing the elastomeric material from the wound sheet, and (e) sintering the wound sheet.
Claim 2
Independent Claim
60 words
A method for shaping a tetrafluoroethylene resin pipe which comprises: (a) winding a porous sheet of tetrafluoroethylene resin which is not sintered around a mandrel, (b) covering the wound sheet with an elastomeric material, (c) isotactically pressing the wound sheet covered with the elastomeric material, (d) removing the elastomeric material from the wound sheet, and (e) sintering the wound sheet.
Claim 3
Dependent Claim
22 words
The method of claim 1, wherein said wound sheet covered with the elastomeric material is isotactically pressed by means of liquid pressure.
Claim 4
Dependent Claim
34 words
The method of claim 1, wherein said porous sheet of tetrafluoroethylene resin which is not sintered is a porous sheet prepared by paste-extruding a tetrafluoroethylene resin fine powder into a sheet, and calendering it.
Claim 5
Dependent Claim
24 words
The method of claim 3, wherein said porous sheet is a porous sheet prepared by stretching said porous sheet prepared by paste-extruding and calendering.
Claim 6
Dependent Claim
16 words
The method of claim 1, whenever the wound sheet is sintered while wound around the mandrel.
Claim 7
Dependent Claim
17 words
The method of claim 1, wherein said porous sheet contains the least one member of filler materials.
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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) | 1995-07-07 | 1996-01-06 | 1996-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-07 | 2000-01-06 | 2000-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-07 | 2004-01-06 | 2004-07-07 | $7700.00 | Window Closed / Lapsed |