US3824115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinylidene fluoride composition and coating thereof
Assignee: Kureha Corp
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Filing: 1971-10-20
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Granted: 1974-07-16
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Expires: 1991-10-20
Abstract
Abstract A METAL SURFACE IS PROTECTIVELY POWDER COATED WITH AN UNDERCOATED AND THEN WITH AN OVERCOAT OF A POLYVINYLIDENE FLUORIDE, THE RATIO OF THE THICKNESS OF THE OVERCOAT AND THE UNDERCOAT BEING FROM 0.25 TO 4, THE UNDERCOAT BEING A COMPOSITION PREPARED BY MIXING FROM 10 TO 100 PARTS BY WEIGHT OF AT LEAST ONE INORGAIC SUBSTANCE HAVING RESISTANCE OF ACIDS AND ALKALIS WITH 100 PARTS BY WEIGHT OF AT LEAST ONE POLYVINYLIDENE FLUORIDE WHICH HAS AN INHERENT VISCOSITY FROM 0.6 TO 1.4 AND IS A HOMOPOLYMER OR A COPOLYMER CONTAINING AT LEAST 90 MOL PERCENT OF VINYLIDENE FLUORIDE.
Inventors
- 👤 M Segawa
- 👤 Y Kawakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:59
CPC Classifications
C; C09; C09D; C09D127/00; C09D127/02; C09D127/12; C09D127/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |