Patent US3811980A successfully refreshed from Google Patents.
US3811980A
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US
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Process for mixed solvent priming and cementing of pressure pipes of polyvinyl chloride
Assignee: Henkel AG and Co KGaA
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Filing: 1972-05-03
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Granted: 1974-05-21
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Expires: 1992-05-03
Abstract
Abstract IN THE PROCESS FOR THE CEMENTING OF POLYVINYL CHLORIDE PIPES, WHICH COMPRISES THE STEPS OF APPLYING A COATING CONSISTING OF POLYVINYL CHLORIDE DISSOLVED IN A SOLVENT TO THE PIPE SURFACES TO BE CEMENTED, JOINING THE COATED PIPE SURFACES TO EACH OTHER, AND DRYING OFF THE THE SOLVENT; THE IMPROVEMENT WHICH COMPRISES TREATING THE SURFACES TO BE CEMENTED, PRIOR TO THEIR ACTUALLY BEING COATED WITH SAID COATING, WITH A MIXTURE CONSISTING ESSENTIALLY OF (A9 90 PARTS BY VOLUME OF BUTANONE, (B) 3 TO 20 PARTS BY VOLUME OF CYCLOHEXANONE AND (C) 0 TO 3 PARTS BY VOLUME OF TETRAHYDROFURAN.
Inventors
- 👤 B Roderhoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:44
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/02; B; B29; B29C; B29C65/00; B29C65/48; B29C65/4805; B29C65/481; B29C65/482; B29C65/4895; B29C66/00; B29C66/50; B29C66/51; B29C66/52; B29C66/522; B29C66/5229; B29C66/70; B29C66/71; C08J5/00; C08J5/12; C08J5/124; C08J5/125; B29K; B29K2027/00; B29K2027/06; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909
Claims Analysis
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References Cited (Backward Citations)
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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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |