Patent US3920879A successfully refreshed from Google Patents.
US3920879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass fiber filled polyamide composites
Assignee: Honeywell International Inc
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Filing: 1973-06-04
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Granted: 1975-11-18
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Expires: 1993-06-04
Abstract
Abstract Long glass fiber reinforcement allows the use of extremely low molecular weight polymer in a composite which is formable in a mold held at ambient temperatures by preheating the composite sheet outside of the mold. The glass-reinforced, low molecular weight polyamide, per se, may be formed in a conventional metal stamping mold and exhibits excellent performance and good surface properties.
Inventors
- 👤 Leon Segal
- 👤 Hendrikus J Oswald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:44
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/003; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/18; B32B27/34; B32B5/00; B32B5/22; B32B5/24; B32B5/26; C; C08; C08J; C08J5/00; C08J5/04; C08J5/0405; C08J5/043; B29K; B29K2309/00; B29K2309/08; B32B2262/00; B32B2262/10; B32B2262/101; C08J2377/00; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1043; Y10T156/1044; Y10T428/00; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/249942; Y10T428/249946; Y10T428/31504; Y10T428/31725; Y10T428/31728; Y10T428/31732
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
97 words
A HIGH IMPACT RESIN SHEET FORMABLE INTO SHAPED OBJECTS WHEREIN THE SHAPED SHEET IS A LAMINATE COMPRISING: A. AT LEAST ONE LAYER OF AN AMIDE POLYMER OR COPOLYMER RESIN AT LEAST 30% OF WHICH IS AN AMIDE, SAID POLYMER OR COPOLYMER HAVING RECURRING AMIDE GROUPS AS AN INTEGRAL PART OF THE MAIN POLYMER CHAIN AND HAVING A WEIGHT AVERAGE MOLECULAR WEIGHT BETWEEN ABOUT 3,000 AND 25,000, SAID POLYMER OR COPOLYMER INCORPORATING GLASS FIBER HAVING A LENGTH OF AT LEAST ABOUT 1 INCH FUSED TO B. AT LEAST ONE LAYER OF ANOTHER THERMOPLASTIC LONG CHAIN SYNTHETIC POLYMER RESIN.
Claim 2
Dependent Claim
97 words
A HIGH IMPACT RESIN SHEET FORMABLE INTO SHAPED OBJECTS WHEREIN THE SHAPED SHEET IS A LAMINATE COMPRISING: A. AT LEAST ONE LAYER OF AN AMIDE POLYMER OR COPOLYMER RESIN AT LEAST 30% OF WHICH IS AN AMIDE, SAID POLYMER OR COPOLYMER HAVING RECURRING AMIDE GROUPS AS AN INTEGRAL PART OF THE MAIN POLYMER CHAIN AND HAVING A WEIGHT AVERAGE MOLECULAR WEIGHT BETWEEN ABOUT 3,000 AND 25,000, SAID POLYMER OR COPOLYMER INCORPORATING GLASS FIBER HAVING A LENGTH OF AT LEAST ABOUT 1 INCH FUSED TO B. AT LEAST ONE LAYER OF ANOTHER THERMOPLASTIC LONG CHAIN SYNTHETIC POLYMER RESIN.
Claim 3
Dependent Claim
17 words
The laminate sheet of claim 1 wherein the low molecular weight amide polymer (a) is nylon 6.
Claim 4
Dependent Claim
17 words
The laminate sheet of claim 1 wherein the low molecular weight amide polymer (a) is nylon 6,6.
Claim 5
Dependent Claim
27 words
The laminate sheet of chain 1 wherein the glass fiber is present in amounts of about 10 to about 75% by weight of the polymer of (a).
Claim 6
Dependent Claim
27 words
The laminate sheet of chain 1 wherein the glass fiber is present in amounts of about 10 to about 75% by weight of the polymer of (a).
Claim 7
Dependent Claim
15 words
The laminate sheet of claim 1 wherein the polymer of layer (b) is a polyamide.
Claim 8
Dependent Claim
33 words
The laminate sheet of claim 1 wherein the low molecular weight amide polymer (a) has incoprorated therein filler in amounts of about 1 to about 50% by weight of the polymer of (a).
Claim 9
Dependent Claim
15 words
The laminate sheet of claim 5 wherein the polymer of layer (b) is nylon 6.
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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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |