US3728163A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkaline liquids for cleaning metals
Assignee: Dulux Australia Ltd
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Filing: 1971-05-10
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Granted: 1973-04-17
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Expires: 1991-05-10
Abstract
Abstract GRAIN-REFINING PRETREATMENT LIQUIDS FOR FERROUS OR ZINCCCONTAINING METAL SURFACES, WHICH HAVE A PH OF AT LEAST 4.5 AND CONTAIN A TITANIUM GRAIN-REFININGG COMPOUND ARE STABILISED BY THE ADDITION THERETO OF A SOLUBLE COPOLYMER OF MALEIC ACID (ANHYDRIDE), FUMARIC ACID OR CITRACONNIC ACID AND ETHYLENE OR A METHYL, ETHYL OR CYCLOHEXYL VINLY ETHER. THE COPOLYMERS MUST HAVE A VISCOSITY AS A 4% BY WEIGHT SOLUTION IN WATER OF PH 9 OF AT LEAST 3.5 CENTIPOISE AT 25* C. A PROCESS OFF ZINC PHOSPHATING IN WHICH THE GRAIN-REFINING LIQUID SO-STABILISED IN A WATERRINSE IMMEDIATELY PRECEDING A PHOSPHATING LIQUID IS ALSO DISCLOSED.
Inventors
- 👤 A Morrison
- 👤 H Herrmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:34
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/02; C11D3/04; C11D3/06; C11D3/16; C11D3/37; C11D3/3746; C11D3/3757; C11D3/3765; C23; C23C; C23C22/00; C23C22/78; C23C22/80
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |