US3773705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic moulding compositions reinforced with a mixture of glass and asbestos fibers
Assignee: Turner Brothers Asbestos Co Ltd
•
Filing: 1971-11-12
•
Granted: 1973-11-20
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Expires: 1991-11-12
Abstract
Abstract Thermoplastic compositions comprise a thermoplastic polymer and are reinforced by a mixture of asbestos fibres and glass fibres. The compositions may be granular moulding compositions or moulded articles.
Inventors
- 👤 G Wicker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:14
CPC Classifications
B; B29; B29B; B29B9/00; B29B9/12; B29B9/14; B29B9/02; B29B9/06; C; C08; C08K; C08K7/00; C08K7/02; C08K7/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
25 words
A thermoplastic composition according to claim 1, wherein the weight ratio of glass fibres to asbestos fibres is within the range from 1:1 to 1:9.
Claim 2
Dependent Claim
24 words
A thermoplastic composition according to claim 1, wherein the asbestos fibres comprise essentially asbestos of grades 4, 5 or 6 of the Canadian Classification.
Claim 3
Dependent Claim
38 words
A thermoplastic composition according to claim 1, in which the weight of said polymeric material is from 60 to 80 percent and in which the weight ratio of glass fibres to asbestos fibres is from 3:7 to 7:3.
Claim 4
Dependent Claim
54 words
A method of manufacturing a thermoplastic composition as claimed in claim 1 in the form of a granular moulding material, comprising compounding together (i), (ii) and (iii) as described in claim 1 at a temperature above the softening point of the polymeric material, extruding the resulting compounded composition and granulating the extrudate so formed.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |