Patent US2788366A successfully refreshed from Google Patents.
US2788366A
Expired / Lapsed
US
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Preparation of terephthalic acid
Assignee: Glanzstoff AG
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Filing: 1953-01-26
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Granted: 1957-04-09
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Expires: 1973-01-26
Abstract
No abstract record available.
Inventors
- 👤 Lotz Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 03:24
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/27
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
THE METHOD OF PREPARING TEREPHTHALIC ACID WHICH COMPRISES TREATING P-XYLYLENE DICHLORIDE AT A TEMPERATURE ABOVE THE MELTING POINT OF P-XYLYLENE DICHLORIDE AND AT ORDINARY PRESSURE, WITH NITRIC ACID OF A CONCENTRATION OF ABOUT 20%.
Claim 2
Independent Claim
34 words
THE METHOD OF PREPARING TEREPHTHALIC ACID WHICH COMPRISES TREATING P-XYLYLENE DICHLORIDE AT A TEMPERATURE ABOVE THE MELTING POINT OF P-XYLYLENE DICHLORIDE AND AT ORDINARY PRESSURE, WITH NITRIC ACID OF A CONCENTRATION OF ABOUT 20%.
References Cited (Backward Citations)
US939940A
Cited
US1332028A
Cited
US1488730A
Cited
GB655074A
Cited
US2563820A
Cited
GB644707A
Cited
US2666786A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-08 | 1960-10-08 | 1961-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-08 | 1964-10-08 | 1965-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-08 | 1968-10-08 | 1969-04-09 | $7700.00 | Window Closed / Lapsed |