Patent US4132578A successfully refreshed from Google Patents.
US4132578A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic pipe welding apparatus and method
Assignee: Individual
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Filing: 1976-10-15
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Granted: 1979-01-02
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Expires: 1996-10-15
Abstract
Abstract A method and apparatus for welding PVC pipe which includes a means to clamp and apply welding heat so that plastic pipes may be welded while under external pressure adapted to offset internal pressures. The method includes the steps of placing a clamp about a splice to be welded, tightening the clamp and applying heat through the clamp to the plastic in sufficient quantities to cause the plastic to fuse. The steps are carried out by utilizing an apparatus comprised of a clamp which is adapted to encompass the area to be welded and apply a constricting force to that area while heat is transferred through the clamping means to the plastic.
Inventors
- 👤 Harold A. Gell, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:28
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/80; B29C66/84; B29C66/861; B29C65/00; B29C65/02; B29C65/18; B29C65/24; B29C65/30; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/50; B29C66/51; B29C66/52; B29C66/522; B29C66/5221; B29C66/81; B29C66/812; B29C66/8126; B29C66/81261; B29C66/814; B29C66/8145; B29C66/81471; B29C66/841; B29C66/8414; F; F16; F16L; F16L47/00; F16L47/02; B29C65/245; B29C65/26; B29C65/28; B29C65/32; B29C66/004; B29C66/0046; B29C66/00461; B29C66/5229; B29C66/52291; B29C66/52292; B29C66/70; B29C66/71; Y; Y10; Y10S; Y10S285/00; Y10S285/919; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1355
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
62 words
A method of welding a plastic pipe which includes the steps of: bringing together two separate pieces of plastic pipe to be welded to form a splice; placing a bimetallic clamp about said splice; and applying heat to said bimetallic clamp in sufficient quantities to cause said bimetallic clamp to tighten about said splice and to cause the plastic thereunder to fuse.
Claim 2
Independent Claim
62 words
A method of welding a plastic pipe which includes the steps of: bringing together two separate pieces of plastic pipe to be welded to form a splice; placing a bimetallic clamp about said splice; and applying heat to said bimetallic clamp in sufficient quantities to cause said bimetallic clamp to tighten about said splice and to cause the plastic thereunder to fuse.
Claim 3
Dependent Claim
32 words
A method as described in claim 1 including the additional step of: applying a release agent to the inner surface of said bimetallic clamp before applying said bimetallic said splice clamp to.
Claim 4
Dependent Claim
30 words
A method as defined in claim 1 further including the step of applying a plastic filler rod to the plastic pipe to be welded prior to applying said bimetallic clamp.
References Cited (Backward Citations)
US2360950A
Cited
US2601028A
Cited
US3002871A
Cited
US2963394A
Cited
US3022209A
Cited
US2930634A
Cited
US3035958A
Cited
US3235289A
Cited
US3506519A
Cited
US3620896A
Cited
US3788928A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-01 | 1982-07-03 | 1983-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-01 | 1986-07-03 | 1987-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-01 | 1990-07-03 | 1991-01-02 | $7700.00 | Window Closed / Lapsed |