US3554955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Primers for coating surfaces with polytetrafluoroethylene and polytetrafluoroethylene dispersions containing such primers
Assignee: Hoechst AG
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Filing: 1967-11-29
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Granted: 1971-01-12
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Expires: 1987-11-29
Abstract
Abstract THE PRESENT INVENTION RELATES TO POLYTETRAFLUOROETHYLENE DISPERSIONS FOR COATING SURFACES OF METAL, GLASS OR CERAMICS. THE DISPERSIONS CONTAIN SOLUBLE ADDITIVES WHICH CONSISTS OF COMPLEX COMPOUNDS OF METAL HYDROXIDES, PREFERABLY COPPER-, CADMIUM- OR ZINC HYDROXIDE, WITH 2 TO 6 MOLES OF PRIMARY AS LIGANDS, OR HYDROXOZINCATES. THESE ADDITIVES IMPROVE THE POLYTETRAFLUOROETHYLENE COATINGS IN RESPECT OF ADHERENCE TO THE SUBSTRATE AND FREEDOM FROM CRACKS AND VOIDS.
Inventors
- 👤 Robert Hartwimmer
- 👤 Herbert Fitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:25
CPC Classifications
C; C09; C09D; C09D127/00; C09D127/02; C09D127/12; C09D127/18
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |