US3297580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Neutral metal cleaning compositions containing hydrazine and a polycarboxylamino acid
Assignee: Individual
•
Filing: 1964-06-17
•
Granted: 1967-01-10
•
Expires: 1984-06-17
Abstract
No abstract record available.
Inventors
- 👤 Edgar C Pitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:28
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A SUBSTANTIALLY NEUTRAL METAL CLEANING COMPOSITION CONSISTING ESSENTIALLY OF AN AQUEOUS SOLUTION OF HYDRAZINE AND A POLYCARBOXYLAMINO ACID HAVING 3 TO 5 CARBOXYL GROUPS IN PROPORTIONS YIELDING A SOLUTION HAVING A PH BETWEEN 6.5 TO 9.5 AND WHEREIN THE CONCENTRATION OF HYDRAZINE IS FROM 0.1 MOLAR TO 0.5 MOLAR.
Claim 2
Dependent Claim
49 words
A SUBSTANTIALLY NEUTRAL METAL CLEANING COMPOSITION CONSISTING ESSENTIALLY OF AN AQUEOUS SOLUTION OF HYDRAZINE AND A POLYCARBOXYLAMINO ACID HAVING 3 TO 5 CARBOXYL GROUPS IN PROPORTIONS YIELDING A SOLUTION HAVING A PH BETWEEN 6.5 TO 9.5 AND WHEREIN THE CONCENTRATION OF HYDRAZINE IS FROM 0.1 MOLAR TO 0.5 MOLAR.
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) | 1970-01-09 | 1970-07-11 | 1971-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-09 | 1974-07-11 | 1975-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-09 | 1978-07-11 | 1979-01-10 | $7700.00 | Window Closed / Lapsed |