US2845400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrazine resins
Assignee: WR Grace and Co
•
Filing: 1955-08-12
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Granted: 1958-07-29
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Expires: 1975-08-12
Abstract
No abstract record available.
Inventors
- 👤 Rudner Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:17
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/043
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
A PROCESS FOR PREPARING HYDRAZINE CONTAINING RESINS CAPABLE OF CHELATING BOTH COPPER AND CHROMINUM WHICH COMPRISES REACTING IN THE PRESENCE OF ANIONS OF A STRONG MINERAL ACID: (A) 0.4 TO 2.6 EQUIVALENTS OF
Claim 2
Dependent Claim
33 words
A PROCESS FOR PREPARING HYDRAZINE CONTAINING RESINS CAPABLE OF CHELATING BOTH COPPER AND CHROMINUM WHICH COMPRISES REACTING IN THE PRESENCE OF ANIONS OF A STRONG MINERAL ACID: (A) 0.4 TO 2.6 EQUIVALENTS OF
References Cited (Backward Citations)
FR826512A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-28 | 1962-01-27 | 1962-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-28 | 1966-01-27 | 1966-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-28 | 1970-01-27 | 1970-07-29 | $7700.00 | Window Closed / Lapsed |