US3650864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making filament reinforced a-stage profiles
Assignee: Goldsworthy Engineering Inc
•
Filing: 1969-07-23
•
Granted: 1972-03-21
•
Expires: 1989-07-23
Abstract
Abstract Fiberglass filament unwound from a series of spools is impregnated with a resin matrix and passed through a pair of rollers or sizing bushing for removing the excess resin and air therefrom. The resin impregnated fiberglass is then envelopely enclosed within a sheet of unidirectionally oriented plastic film, the latter being sealed along its upper longitudinal margin by means of an ultrasonic weld or heat weld. The film enclosed composite may then be heated to shrink the film. The temperature should be sufficiently low to have no curing effect on the resin leaving it in the uncured or so-called ''''A-stage.'''' For some systems, it is desirable to advance the resin to a semicured or so-called ''''B-stage.'''' The film enclosed composite may then be wound upon suitable reels and stored for further use.
Inventors
- 👤 William B Goldsworthy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:09
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/40; B29C70/50; B29C70/52; B29C70/525; B29C70/527; B26; B26D; B26D1/00; B26D1/01; B26D1/04; B29C31/00; B29C31/002; B29C63/00; B29C63/02; B29C63/04; B29C63/06; B29C63/065; B29C63/38; B29C63/40; B29C67/00
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
23 words
The method of claim 1 further characterized in that air is removed from said composite before enveloping said profile form in said film.
Claim 2
Dependent Claim
17 words
The method of claim 1 further characterized in that the margins of said film are ultrasonically sealed.
Claim 3
Dependent Claim
17 words
The method of claim 1 further characterized in that the margins of said film are heat sealed.
Claim 4
Dependent Claim
24 words
The method of claim 1 further characterized in that the shrinking of the film is pErformed by passing the same into a heated zone.
Claim 5
Dependent Claim
29 words
The method of claim 1 further characterized in that air is forced rearwardly with respect to said profile form as said profile form is being enveloped in said film.
Claim 6
Dependent Claim
32 words
The method of claim 1 further characterized in that the profile form and film are passed into a zone of reduced pressure and enveloping is performed in the zone of reduced pressure.
Claim 7
Dependent Claim
24 words
The method of claim 7 further characterized in that the sealing of the margins of said film is performed in the reduced pressure zone.
Claim 8
Dependent Claim
20 words
The method of claim 1 further characterized in that said matrix remains in the A-stage after said film is shrunk.
Claim 9
Dependent Claim
21 words
The method of claim 1 further characterized in that said matrix is cured to the B-stage after said film is shrunk.
Claim 10
Dependent Claim
29 words
The method of claim 1 further characterized in that a suitable design formed on the inner surface of said film is transferred to the exterior of said profile form.
Claim 11
Dependent Claim
24 words
The method of claim 1 further characterized in that the shape and surface finish of said profile form is substantially imparted by said film.
Claim 12
Dependent Claim
18 words
The method of claim 1 further characterized in that a second film is wrapped about said flexible film.
Claim 13
Independent Claim
169 words
A method of producing discrete lengths of filament reinforced profile forms comprising the steps of: a. impregnating a plurality of filaments with a curable matrix; b. consolidating said impregnated filaments into a linear profile form; c. wrapping said profile form in a non-porous flexible film in a manner to provide for film margins having contiguous surfaces extending along the length of said profile form; d. welding said film margins together along their contiguous surfaces to enclose said profile form without curing said resin matrix; e. shrinking said film about said profile form primarily in the direction being transverse to the length of said profile form to tightly enclose the same for retention of said resin in said A-stage; f. curing said resin matrix to make the same rigid at selected intervals along the length of said profile form; and g. severing said profile form at said cured intervals to form discrete lengths of film enclosed A-stage profile forms being sealed at their respective ends by said cured resin matrix.
Claim 14
Dependent Claim
22 words
The method of claim 14 further characterized in that the surface finish of the profile form is substantially imparted by said film.
Claim 15
Dependent Claim
18 words
The method of claim 14 further characterized in that a second film is wrapped about said flexible film.
Claim 16
Dependent Claim
17 words
The method of claim 14 further characterized in that the filaments are continuously drawn from a source.
Claim 17
Dependent Claim
16 words
The method of claim 17 wherein the impregnated filaments are consolidated around a given longitudinal axis.
Claim 18
Dependent Claim
29 words
The method of claim 18 wherein said profile form is deformed at said selected intervals immediately prior to the curing of the resin matrix residing in said selected intervals.
Claim 19
Dependent Claim
30 words
The method of claim 19 wherein means are provided for grasping said deformed and cured intervals of said profile form and for pulling said profile form through the method steps.
References Cited (Backward Citations)
US2631955A
Cited
US2951006A
Cited
US2821155A
Cited
US3205114A
Cited
US3234064A
Cited
US3301648A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |