Patent US4257929A successfully refreshed from Google Patents.
US4257929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Poly(butylene terephthalate) molding resin
Assignee: General Electric Co
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Filing: 1979-08-16
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Granted: 1981-03-24
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Expires: 1999-08-16
Abstract
Abstract Poly(1,4-butylene terephthalate) resins filled with mineral fillers show substantial improvement in impact strength, distortion temperature under load, and flexural strength if the individual particles of the filler, e.g., mica, are coated with unsintered poly(tetrafluoroethylene) resin.
Inventors
- 👤 Willem F. H. Borman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:00
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/10; C08K3/00; C08K3/34; C08K3/40
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
26 words
A composition comprising (i) a poly(1,4-butylene terephthalate) resin, and (ii) a particulate mineral filler, individual particles of said mineral filler being coated with unsintered poly(tetrafluoroethylene) resin.
Claim 2
Dependent Claim
26 words
A composition comprising (i) a poly(1,4-butylene terephthalate) resin, and (ii) a particulate mineral filler, individual particles of said mineral filler being coated with unsintered poly(tetrafluoroethylene) resin.
Claim 3
Dependent Claim
32 words
A composition as defined in claim 1 wherein said mineral filler comprises from about 1 to about 70 parts by weight per 100 parts by weight of resin (i) and filler (ii).
Claim 4
Dependent Claim
32 words
A composition as defined in claim 2 wherein said mineral filler comprises from about 5 to about 50 parts by weight per 100 parts by weight of resin (i) and filler (ii).
Claim 5
Dependent Claim
13 words
A composition as defined in claim 1 wherein said mineral filler comprises mica.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |