Patent US4753612A successfully refreshed from Google Patents.
Patent US1858639A successfully refreshed from Google Patents.
Patent US2496376A successfully refreshed from Google Patents.
Patent US385054A successfully refreshed from Google Patents.
Patent US3413336A successfully refreshed from Google Patents.
US3413336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of aryl esters of aromatic dicarboxylic acids
Assignee: Chemische Werke Witten GmbH
•
Filing: 1964-07-31
•
Granted: 1968-11-26
•
Expires: 1984-07-31
Abstract
No abstract record available.
Inventors
- 👤 Hulsmann Hans-Leo
- 👤 Renckhoff Gustav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:35
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/02; C07C67/10; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08L; C08L67/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB314646A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-26 | 1972-05-27 | 1972-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-26 | 1976-05-27 | 1976-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-26 | 1980-05-27 | 1980-11-26 | $7700.00 | Window Closed / Lapsed |