US3922186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for lining surfaces with sheets of polyvinylidene fluoride
Assignee: Kureha Corp
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Filing: 1972-10-12
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Granted: 1975-11-25
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Expires: 1992-10-12
Abstract
Abstract A method is disclosed for protecting a surface from corrosion that involves bonding, by means of an adhesive, a glass cloth surface of a laminate to the surface to be protected. The exposed surface of the laminate is a polyvinylidene fluoride having a Eta inh of 0.7 to 1.5.
Inventors
- 👤 Masahiro Segawa
- 👤 Yukichika Kawakami
- 👤 Mitsuru Itoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:22
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/12; B01; B01J; B01J19/00; B01J19/02; B32B27/30; B32B27/304; B32B7/00; B32B7/04; B32B7/12; B01J2219/00; B01J2219/02; B01J2219/0204; B01J2219/0209; B01J2219/0245; B32B2307/00; B32B2307/70; B32B2307/714; B32B2315/00; B32B2315/08; B32B2315/085; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24777; Y10T428/24785; Y10T428/28; Y10T428/2848; Y10T428/31504; Y10T428/3154
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
100 words
A METHOD FOR PROTECTING A SURFACE FROM CORROSION COMPRISING: PROVIDING A LAMINATED SHEET OR SHEETS, SAID SHEET OR SHEETS COMPRISING A GLASS CLOTH AND POLYVINYLIDENE FLUORIDE SHEET HAVING AN NINH OF 0.7-1.5, SAID GLASS CLOTH BEING PARTIALLY EMBEDDED IN SAID POLYVINYLIDENE FLUORIDE SO AS TO LEAVE ONE SURFACE OF SAID GLASS CLOTH EXPOSED, ADHESIVELY BONDING SAID EXPOSED SURFACE OF SAID GLASS CLOTH TO THE SURFACE TO BE PROTECTED, SAID ADHESIVE BEING APPLIED TO SAID EXPOSED SURFACE; AND HOT-GAS WELDING ADJOINING EDGES OF SAID SHEET OR SHEETS USING A WELDING BAR OF POLYVINYLIDENE FLUORIDE HAVING A NINH OF 0.7 TO 1.3.
Claim 2
Independent Claim
100 words
A METHOD FOR PROTECTING A SURFACE FROM CORROSION COMPRISING: PROVIDING A LAMINATED SHEET OR SHEETS, SAID SHEET OR SHEETS COMPRISING A GLASS CLOTH AND POLYVINYLIDENE FLUORIDE SHEET HAVING AN NINH OF 0.7-1.5, SAID GLASS CLOTH BEING PARTIALLY EMBEDDED IN SAID POLYVINYLIDENE FLUORIDE SO AS TO LEAVE ONE SURFACE OF SAID GLASS CLOTH EXPOSED, ADHESIVELY BONDING SAID EXPOSED SURFACE OF SAID GLASS CLOTH TO THE SURFACE TO BE PROTECTED, SAID ADHESIVE BEING APPLIED TO SAID EXPOSED SURFACE; AND HOT-GAS WELDING ADJOINING EDGES OF SAID SHEET OR SHEETS USING A WELDING BAR OF POLYVINYLIDENE FLUORIDE HAVING A NINH OF 0.7 TO 1.3.
Claim 3
Dependent Claim
36 words
The method of claim 1 wherein said hot-gas welding is effected by applying hot air to said adjoining edges at a temperature of 200* to 400*C and at a guage pressure of 0.2 to 1 kg/cm2.
Claim 4
Dependent Claim
62 words
The method as set forth in claim 1 wherein said laminated sheet is formed by a method comprising: forming a polyvinylidene fluoride resin having a inh of 0.7 to 1.3 into a plastic sheet; superimposing said plastic sheet on a glass cloth while said plastic sheet is still partially molten to form a composite; and compressing said composite to form a laminate.
Claim 5
Dependent Claim
16 words
The method of claim 1 wherein said polyvinylidene fluoride has a thickness of about 1 mm.
Claim 6
Dependent Claim
16 words
The method of claim 1 wherein said glass cloth has a thickness of about 0.25 mm.
Claim 7
Dependent Claim
25 words
The method of claim 1 wherein said adhesive is a member from the group consisting of epoxy resins, polyester resins, phenolic resins, and rubber-based resins.
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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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |