Patent US4460733A successfully refreshed from Google Patents.
US4460733A
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Polycarbonate compositions having low gloss values
Assignee: Bayer Corp
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Filing: 1982-11-29
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Granted: 1984-07-17
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Expires: 2002-11-29
Abstract
Abstract The present invention is directed to a polycarbonate composition comprising finely divided silica which composition is characterized by low gloss.
Inventors
- 👤 Russell P. Carter, Jr.
- 👤 In C. Lim
- 👤 Gerard E. Reinert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:15
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/36
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
61 words
A thermoplastic molding composition comprising a polycarbonate resin and about 0.6 to about 10.0% of silica which is characterized in that its average particle size is from about 1 to about 9.5 microns and further in that its specific surface area is from about 2.2 to about 0.45 m 2 /g, said percentages being relative to the weight of said composition.
Claim 2
Dependent Claim
61 words
A thermoplastic molding composition comprising a polycarbonate resin and about 0.6 to about 10.0% of silica which is characterized in that its average particle size is from about 1 to about 9.5 microns and further in that its specific surface area is from about 2.2 to about 0.45 m 2 /g, said percentages being relative to the weight of said composition.
Claim 3
Dependent Claim
40 words
The composition of claim 1 wherein said silica is characterized in that its average particle size is between about 1.9 and about 8.8 microns and that its specific surface area is between about 2.06 to about 0.54 m 2 /g.
Claim 4
Dependent Claim
15 words
The composition of claim 2 wherein said amount of silica is between 0.9 and 5.0%.
References Cited (Backward Citations)
US3359238A
Cited
GB1069752A
Cited
US3360498A
Cited
GB1237164A
Cited
DE2324427A1
Cited
US4065401A
Cited
US4110273A
Cited
EP0066772A2
Cited
US4384067A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |