Patent US4728700A successfully refreshed from Google Patents.
US4728700A
Expired / Lapsed
US
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Process and composition
Assignee: General Electric Co
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Filing: 1987-07-13
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Granted: 1988-03-01
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Expires: 2007-07-13
Abstract
Abstract A method for producing a high molecular weight aromatic polycarbonate composite material which comprises a. coating the reinforcing material with a catalyst system which polymerizes aromatic cyclic carbonate oligomers to high molecular weight aromatic polycarbonate under appropriate conditions; b. contacting the catalyst system coated reinforcing material with a mixture of aromatic cyclic carbonate oligomers and; c. polymerizing the mixture of aromatic cyclic carbonate oligomers to high molecular weight aromatic polycarbonate.
Inventors
- 👤 Dwight J. Patterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:36
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; C08G; C08G64/00; C08G64/20; C08G64/30; C08J2369/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
38 words
A composition comprising (1) a reinforcing material coated with a catalyst system which can convert aromatic cyclic carbonate oligomers to high molecular weight polycarbonate and (2) an aromatic cyclic carbonate oligomer in contact with said coated reinforcing material.
Claim 2
Dependent Claim
38 words
A composition comprising (1) a reinforcing material coated with a catalyst system which can convert aromatic cyclic carbonate oligomers to high molecular weight polycarbonate and (2) an aromatic cyclic carbonate oligomer in contact with said coated reinforcing material.
Claim 3
Dependent Claim
13 words
The composition in accordance with claim 1 wherein the reinforcing material is glass.
Claim 4
Dependent Claim
14 words
The composition in accordance with claim 2 wherein the glass is in fibrous form.
Claim 5
Dependent Claim
14 words
The composition in accordance with claim 1 wherein the glass is in mat form.
Claim 6
Dependent Claim
18 words
The composition in accordance with claim 1 wherein the catalyst system is tetra butyl ammonium tetra phenyl borate.
Claim 7
Dependent Claim
16 words
The composition in accordance with claim 1 wherein the cyclic carbonate oligomer is based on bisphenol-A.
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) | 1991-03-01 | 1991-08-31 | 1992-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-01 | 1995-08-31 | 1996-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-01 | 1999-08-31 | 2000-03-01 | $7700.00 | Window Closed / Lapsed |