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US4675965A
Expired / Lapsed
US
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Method for manufacturing a pipe part from fibre-reinforced thermosetting synthetic material
Assignee: Wavin BV
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Filing: 1985-12-20
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Granted: 1987-06-30
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Expires: 2005-12-20
Abstract
Abstract In the manufacture of a pipe part from fibre-reinforced thermosetting resin, such as a T-piece, preformed pipe parts made of fibre-reinforced thermosetting resin are placed on a mandrel defining the inside shape of the pipe part, the external surface of the mandrel being partially covered. The space between the mandrel and the inside of the pre-formed pipe parts is sealed and the parts of the pre-formed pipe parts adjacent to the uncovered part of the mandrel are chamfered on the outside. Synthetic resin impregnated fibres are then applied to the uncovered part of the mandrel and to at least the chamfered parts of the preformed pipe parts placed on the mandrel, until the pipe part has reached the desired final shape, after which it is cured and the mandrel is removed from the finished pipe part.
Inventors
- 👤 Oege R. Offringa
- 👤 Frederik Van Der Ploeg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:05
CPC Classifications
B; B29; B29D; B29D23/00; B29D23/001; B29D23/003; B29D23/008; B29C; B29C70/00; B29C70/68; B29C70/86; F; F16; F16L; F16L47/00; F16L47/26; F16L47/32; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49428; Y10T29/49442; Y10T29/4998; Y10T29/49982
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
123 words
The method for manufacturing a pipe part from fibre-reinforced thermosetting synthetic material comprising a main pipe part and at least one containing branch pipe part connected to it, which method comprises placing pre-formed pipe parts made of fibre-reinforced thermosetting synthetic material on at least one part of a mandrel defining the inside shape of the pipe part, thereby partially covering the external surface of the mandrel, applying synthetic resin impregnated fibres to the part of the mandrel not covered by the pre-formed pipe parts and to at least the adjacent parts of the pre-formed pipe parts placed on the mandrel until the pipe part has reached the desired final shape, curing the pipe part and removing the mandrel from the finished pipe part.
Claim 2
Independent Claim
123 words
The method for manufacturing a pipe part from fibre-reinforced thermosetting synthetic material comprising a main pipe part and at least one containing branch pipe part connected to it, which method comprises placing pre-formed pipe parts made of fibre-reinforced thermosetting synthetic material on at least one part of a mandrel defining the inside shape of the pipe part, thereby partially covering the external surface of the mandrel, applying synthetic resin impregnated fibres to the part of the mandrel not covered by the pre-formed pipe parts and to at least the adjacent parts of the pre-formed pipe parts placed on the mandrel until the pipe part has reached the desired final shape, curing the pipe part and removing the mandrel from the finished pipe part.
Claim 3
Dependent Claim
57 words
The method according to claim 1, wherein the parts of the pre-formed pipe parts adjacent to the part of the mandrel not covered by the pre-formed pipe parts are chamfered on the outside, the angle between the outside and the inside of the pre-formed pipe parts in the region of the chamfered parts being less than 30°.
Claim 4
Dependent Claim
31 words
The method according to claim 2, wherein the angle between the outside and the inside of the pre-formed pipe parts in the region of the chamfered parts is less than 10°.
Claim 5
Dependent Claim
31 words
The method according to claim 2, wherein the angle between the outside and the inside of the pre-formed pipe parts in the region of the chamfered parts is less than 5°.
Claim 6
Dependent Claim
35 words
The method according to claim 1, wherein the space between the mandrel and the inside of the pre-formed pipe parts is sealed by means of radially expandable elements made of elastic material, such as rubber.
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) | 1990-06-29 | 1990-12-29 | 1991-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-29 | 1994-12-29 | 1995-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-29 | 1998-12-29 | 1999-06-30 | $7700.00 | Window Closed / Lapsed |