US2953531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cerium polymerization catalysts
Assignee: EIDP Inc
•
Filing: 1954-09-21
•
Granted: 1960-09-20
•
Expires: 1974-09-21
Abstract
No abstract record available.
Inventors
- 👤 Anderson Arthur William
- 👤 Merckling Nicholas George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:05
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/02; C08F36/00; C08F36/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
A COMPOSITION OF MATTER SUITABLE AS A POLYMERIZATION CATALYST CONSISTING ESSENTIALLY OF THE REACTION PRODUCT OBTAINED ON ADMIXING, IN AN INERT HYDROCARBON SOLVENT, CERIUM TRICHLORIDE WITH SUFFICIENT QUANTITIES OF A GRIGNARD REAGENT TO REDUCE THE VALENCE STATE TO BELOW 3, IN THE SUBSTANTIAL ABSENCE OF OXYGEN AND WATER.
Claim 2
Dependent Claim
48 words
A COMPOSITION OF MATTER SUITABLE AS A POLYMERIZATION CATALYST CONSISTING ESSENTIALLY OF THE REACTION PRODUCT OBTAINED ON ADMIXING, IN AN INERT HYDROCARBON SOLVENT, CERIUM TRICHLORIDE WITH SUFFICIENT QUANTITIES OF A GRIGNARD REAGENT TO REDUCE THE VALENCE STATE TO BELOW 3, IN THE SUBSTANTIAL ABSENCE OF OXYGEN AND WATER.
References Cited (Backward Citations)
US2485535A
Cited
US2666756A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-20 | 1964-03-21 | 1964-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-20 | 1968-03-21 | 1968-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-20 | 1972-03-21 | 1972-09-20 | $7700.00 | Window Closed / Lapsed |