US3012049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ester-interchange catalysts
Assignee: Uniroyal Inc
•
Filing: 1958-09-09
•
Granted: 1961-12-05
•
Expires: 1978-09-09
Abstract
No abstract record available.
Inventors
- 👤 John C Bill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:00
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/02; C07C39/00; C07C39/12; C07C39/17; C07C69/00; C07C69/76
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
IN A CARBOXYLIC ESTER-INTERCHANGE REACTION IN WHICH THE STARTING MATERIAL AND END PRODUCT ARE SUBSTANTIALLY FREE FROM UNESTERIFIED CARBOXYL GROUPS, THE IMPROVEMENT WHICH CONSISTS IN EFFECTING SAID REACTION IN THE PRESENCE OF A CATALYST CONSISTING OF A PHENOL SELECTED FROM THE CLASS CONSISTING OF COMPOUNDS REPRESENTED BY THE FORMULAE:
Claim 2
Dependent Claim
49 words
IN A CARBOXYLIC ESTER-INTERCHANGE REACTION IN WHICH THE STARTING MATERIAL AND END PRODUCT ARE SUBSTANTIALLY FREE FROM UNESTERIFIED CARBOXYL GROUPS, THE IMPROVEMENT WHICH CONSISTS IN EFFECTING SAID REACTION IN THE PRESENCE OF A CATALYST CONSISTING OF A PHENOL SELECTED FROM THE CLASS CONSISTING OF COMPOUNDS REPRESENTED BY THE FORMULAE:
References Cited (Backward Citations)
US2678935A
Cited
US2790826A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-12-04 | 1965-06-05 | 1965-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-04 | 1969-06-05 | 1969-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-04 | 1973-06-05 | 1973-12-05 | $7700.00 | Window Closed / Lapsed |