Patent US3630933A successfully refreshed from Google Patents.
US3630933A
Expired / Lapsed
US
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Amine inhibitors for acidic cleaning solutions
Assignee: Henkel Corp
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Filing: 1968-01-19
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Granted: 1971-12-28
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Expires: 1988-01-19
Abstract
Abstract ACIDIC CLEANING SOLUTIONS, WHICH HAVE LITTLE OR NOT TENDENCY TO CORRODE METAL SURFACES, CONTAINING AMINE COMPOUNDS PREPARED BY REACTING A SPECIFIC AMINE STARTING MATERIAL, FORMALDEHYDE AND A KETONE IN THE PRESENCE OF ACID, ARE DESCRIBED. THE AMINE STARTING MATERIAL IS OF THE FORMULA CH3-(CH2)N-CH(-R)-NH-Z WHEREIN N IS AN INTEGER RANGING FROM ABOUT 2 TO ABOUT 20, R IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND CH3(CH2)M-1, WHEREIN M IS AN INTEGER RANGING FROM 1 TO ABOUT 21, AND Z IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND THE PROPYLAMINE RADICAL.
Inventors
- 👤 Walter R Dudlik
- 👤 George S Gardner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:25
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/02; C11D7/04; C11D7/08; C11D7/22; C11D7/32; C11D7/3209; C23; C23G; C23G1/00; C23G1/02; C23G1/04; C23G1/06; C23G1/061
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |