US2898355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of cyclopentadienyl group iv-a metal dialkoxy monohalides
Assignee: NL Industries Inc
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Filing: 1955-08-25
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Granted: 1959-08-04
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Expires: 1975-08-25
Abstract
No abstract record available.
Inventors
- 👤 Daniel F Herman
- 👤 Roger M Weil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:52
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/28; C07F17/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A METHOD FOR THE PREPARATION OF ORGANOMETALLIC COMPOUNDS OF METALS OF GROUP IVA OF THE PERIODIC TABLE WHICH COMPRISES FORMING A MIXTURE OF CYCLOPENTADIENE WITH AN AMINE HAVING AN IONIZATION CONSTANT, MEASURED IN WATER, OF AT LEAST 10-4, AND SUBSEQUENTLY FORMING A MIXTURE OF SAID FIRST MIXTURE WITH A GROUP 1VA METAL COMPOUND REPRESENTABLE BY THE FORMULA (RO)2MEX2, WHEREIN R IS AN ALKYL HYDROCARBON RADICAL CONTAINING NO MORE THAN 18 CARBON ATOMS, ME IS A METALOF GROUP IVA OF THE PERIODIC TABLE, AND X IS A HALOGEN ATOM HAVING AN ATOMIC NUMBER NO HIGHER THAN 43, THEREBY FORMING CYCLOPENTADIENYL METAL DIALKOXY MONOHALIDE.
Claim 2
Independent Claim
102 words
A METHOD FOR THE PREPARATION OF ORGANOMETALLIC COMPOUNDS OF METALS OF GROUP IVA OF THE PERIODIC TABLE WHICH COMPRISES FORMING A MIXTURE OF CYCLOPENTADIENE WITH AN AMINE HAVING AN IONIZATION CONSTANT, MEASURED IN WATER, OF AT LEAST 10-4, AND SUBSEQUENTLY FORMING A MIXTURE OF SAID FIRST MIXTURE WITH A GROUP 1VA METAL COMPOUND REPRESENTABLE BY THE FORMULA (RO)2MEX2, WHEREIN R IS AN ALKYL HYDROCARBON RADICAL CONTAINING NO MORE THAN 18 CARBON ATOMS, ME IS A METALOF GROUP IVA OF THE PERIODIC TABLE, AND X IS A HALOGEN ATOM HAVING AN ATOMIC NUMBER NO HIGHER THAN 43, THEREBY FORMING CYCLOPENTADIENYL METAL DIALKOXY MONOHALIDE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-03 | 1963-02-02 | 1963-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-03 | 1967-02-02 | 1967-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-03 | 1971-02-02 | 1971-08-04 | $7700.00 | Window Closed / Lapsed |