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US3397172A
Expired / Lapsed
US
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Process for the preparation of polyacrolein gels and process for improving the properties and sealing of soils, soil formations, structures, structural elements and structural materials
Assignee: Evonik Operations GmbH
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Filing: 1964-02-17
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Granted: 1968-08-13
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Expires: 1984-02-17
Abstract
No abstract record available.
Inventors
- 👤 Schuler Wilhelm Alfons
- 👤 Bader Erich
- 👤 Rink Karl-Heinz
- 👤 Weigert Wolfgang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:31
CPC Classifications
C; C09; C09K; C09K17/00; C09K17/14; C09K17/18; C09K17/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-13 | 1972-02-12 | 1972-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-13 | 1976-02-12 | 1976-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-13 | 1980-02-12 | 1980-08-13 | $7700.00 | Window Closed / Lapsed |