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Patent US2615862A successfully refreshed from Google Patents.
US2615862A
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Process for reacting azelaic dihydrazide with oxalic acid
Assignee: Celanese Corp
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Filing: 1949-04-09
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Granted: 1952-10-28
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Expires: 1969-04-09
Abstract
No abstract record available.
Inventors
- 👤 Jr Samuel B Mcfarlane
- 👤 Alfred L Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:06
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
PROCESS FOR THE PRODUCTION OF A POLYMER, WHICH COMPRISES REACTING AT A TEMPERATURE OF 170 TO 190* C. AZELAIC DIHYDRAZIDE WITH AN EQUIMOLECULAR QUANTITY OF OXALIC ACID IN A REACTION MEDIUM CONSISTING OF NITROBENZENE.
Claim 2
Dependent Claim
34 words
PROCESS FOR THE PRODUCTION OF A POLYMER, WHICH COMPRISES REACTING AT A TEMPERATURE OF 170 TO 190* C. AZELAIC DIHYDRAZIDE WITH AN EQUIMOLECULAR QUANTITY OF OXALIC ACID IN A REACTION MEDIUM CONSISTING OF NITROBENZENE.
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) | 1955-10-28 | 1956-04-28 | 1956-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-28 | 1960-04-28 | 1960-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-28 | 1964-04-28 | 1964-10-28 | $7700.00 | Window Closed / Lapsed |