US3252956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclobutene homopolymers and process for preparing same
Assignee: Montedison SpA
•
Filing: 1962-10-23
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Granted: 1966-05-24
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Expires: 1982-10-23
Abstract
No abstract record available.
Inventors
- 👤 Natta Giulio
- 👤 Mazzanti Giorgio
- 👤 Dall Asta Gino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:00
CPC Classifications
C; C08; C08F; C08F32/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
20 words
A CRYSTALLINE HIGH-MOLECULAR WEIGHT, LINEAR HOMOPOLYMER OF CYCLOBUTENE HAVING MACROMOLECULAR CHAINS CONSISTING OF CYCLOBUTANIC RING ENCHAINMENTS CHARACTERIZED BY THE FORMULA:
Claim 2
Dependent Claim
80 words
A PROCESS FOR POLYMERIZING CYCLOBUTENE TO HIGHMOLECULAR WEIGHT, LINEAR HOMOPOLYMERS WHICH COMPRISES POLYMERIZING THE CYCLOBUTENE IN THE PRESENCE OF AN EFFECTIVE AMOUNT OF A CATALYST PREPARED FROM (1) A VANADIUM HALIDE OR A TITANIUM HALIDE AND (22) AN ORGANOMETALLIC COMPOUND OF THE FORMULA MRAXB WHEREIN M IS METAL FROM GROUP IA, IIA, OR IIIA, R IS ALKYL, X IS HALOGEN, A IS AT LEAST 1 AND EQUALS THE RESIDUAL VALENCE OF THE METAL M, AND B IS ZERO OR 1.
References Cited (Backward Citations)
US3058963A
Cited
US3074918A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-23 | 1969-11-22 | 1970-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-23 | 1973-11-22 | 1974-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-23 | 1977-11-22 | 1978-05-24 | $7700.00 | Window Closed / Lapsed |