US3029253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum chloride solutions
Assignee: Celanese Corp
•
Filing: 1958-06-20
•
Granted: 1962-04-10
•
Expires: 1978-06-20
Abstract
No abstract record available.
Inventors
- 👤 Edward N Wheeler
- 👤 Gene J Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:29
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/06; B01J27/125; B01J27/138; B01J2231/00; B01J2231/30; B01J2231/32; B01J2231/324
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
39 words
IN THE PROCESS OF SYNTHESIZING BETA PROPIOLACTONE BY REACTION OF KETONE WITH FORMALDEHYDE IN THE PRESENCE OF AN ALUMINUM CHLORIDE-ZINC CHLORIDE CATALYST, THE IMPROVEMENT WHICH COMPRISES EMPLOYING ETHYL ACETATE AS THE CARRIER FOR THE ALUMINUM CHLORIDE ZINC CHLORIDE CATALYST.
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) | 1965-04-09 | 1965-10-09 | 1966-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-09 | 1969-10-09 | 1970-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-09 | 1973-10-09 | 1974-04-10 | $7700.00 | Window Closed / Lapsed |