US3701676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for impregnating and sealing cast metal surfaces
Assignee: Evonik Operations GmbH
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Filing: 1970-05-20
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Granted: 1972-10-31
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Expires: 1990-05-20
Abstract
Abstract THE SURFACES OF CAST METAL ARTICLES ARE IMPREGNATED AND/OR SEALED BY INTRODUCING INTO THE PORES OF THE METAL A LIQUID POLYMERIZABLE ESTER OF METHACRYLIC ACID OR ACRYLIC ACID OR A MIXTURE OF BOTH WITH AT LEAST ONE POLYHYDRIC ALCOHOL WHEREUPON THE ESTER IS CURED IN THE ABSENCE OF A POLYMERIZATION CATALYST. THE APPLICATION OF THE ESTER IS EFFECTED UPON APPLICATION OF PRESSURE OR OF A VACUUM OR BY APPLYING, SUCCESSIVELY, BOTH PRESSURE AND A VACUUM. THE POLYMERIZATION IS EFFECTED WITHIN THE PORES OF THE METAL IMPROVE THE IMPERMEABILITY OF THE METAL.
Inventors
- 👤 Erich Bader
- 👤 Karl G Kannenberg
- 👤 Hans-Benno Ricke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:07
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/22; C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/26; C08F20/28; B05D2502/00; B05D3/00; B05D3/02; B05D3/0254; B05D3/04; B05D3/0493
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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |