Patent US4220686A successfully refreshed from Google Patents.
US4220686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Encapsulated impregnated rovings
Assignee: Desoto Aerospace Coatings Inc
•
Filing: 1975-03-12
•
Granted: 1980-09-02
•
Expires: 1995-03-12
Abstract
Abstract Rovings impregnated with solid or preferably semi solid thermosetting resin and which can be handled in textile processing equipment are provided by overcoating the impregnated roving with a thermoplastic resin dispersed in a volatile liquid medium which does not dissolve the thermosetting resin to form an encapsulating membrane of thermoplastic resin around the impregnated roving to thereby provide the strength, flexibility, and surface properties needed for textile handling without degrading the properties desired in the final cured molded product.
Inventors
- 👤 Richard L. Brook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:24
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/22; D02G3/40; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/587; D04H1/64; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/2927; Y10T428/2933; Y10T428/2938; Y10T428/2964; Y10T428/2973
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
43 words
A solid impregnated roving comprising a fibrous roving impregnated with a thermosetting resin in uncured semi solid form, said impregnated roving being encapsulated within a thin membrane coating of thermoplastic encapsulating resin which is compatible in a hot melt with said thermosetting resin.
Claim 2
Dependent Claim
43 words
A solid impregnated roving comprising a fibrous roving impregnated with a thermosetting resin in uncured semi solid form, said impregnated roving being encapsulated within a thin membrane coating of thermoplastic encapsulating resin which is compatible in a hot melt with said thermosetting resin.
Claim 3
Dependent Claim
23 words
An impregnated roving as recited in claim 1 in which said thermosetting resin carries a functional group selected from N-methylol and epoxy groups.
Claim 4
Dependent Claim
21 words
An impregnated roving as recited in claim 1 in which said thermosetting resin is an epoxy resin in admixture with dicyandiamide.
Claim 5
Dependent Claim
25 words
An impregnated roving as recited in claim 3 in which said epoxy resin impregnated roving is overcoated with a solvent-soluble polyamide resin dissolved in methanol.
Claim 6
Dependent Claim
33 words
An impregnated roving as recited in claim 2 in which said encapsulating membrane is provided by a thermoplastic resin containing a functional group providing active hydrogen selected from carboxyl, hydroxyl, and amido groups.
Claim 7
Dependent Claim
18 words
An impregnated roving as recited in claim 1 in which said roving is of generally rectangular cross section.
Claim 8
Dependent Claim
22 words
An impregnated roving as recited in claim 1 in which the encapsulated roving is dusted with a powder to reduce surface tackiness.
References Cited (Backward Citations)
US2671744A
Cited
US3119711A
Cited
US3323176A
Cited
US3296063A
Cited
US3377233A
Cited
US3371476A
Cited
US3579409A
Cited
US3576705A
Cited
US3810784A
Cited
US3679507A
Cited
US3806483A
Cited
US3914504A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |