US3758349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing chemical conversion coatings on metal surfaces
Assignee: Henkel Corp
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Filing: 1971-09-24
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Granted: 1973-09-11
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Expires: 1991-09-24
Abstract
Abstract A METHOD OF PRODUCING A CHEMICAL CONVERSION COATING ON METAL SURFACES USING AN AQUEOUS COATING SOLUTION AND KEEPING THE SOLUTION ACTIVE BY PERIODICALLY ADDING SUPPLEMENTING CHEMICALS COMPRISING CONTACTING THE METAL SURFACE TO BE COATED AT THE BEGINNING OF THE LAYER FORMING TREATMENT WITH A COATING SOLUTION WHICH CONTAINS A MAJORITY OF THE SUPPLEMENTARY CHEMICALS AND AFTER CONTACTING THE METAL PASSING THE UNUSED SUPPLEMENTARY CHEMICALS INTO THE COATING SOLUTION.
Inventors
- 👤 R Engesser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:47
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/73
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |