Patent US3820573A successfully refreshed from Google Patents.
US3820573A
Expired / Lapsed
US
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Tubular laminate and a method of making a tubular laminate
Assignee: Shakespeare and Company
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Filing: 1971-06-22
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Granted: 1974-06-28
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Expires: 1991-06-22
Abstract
Abstract The tubular member is made by forming a layer of chopped glass fibers over the mandrel and thereafter positioning an equal number of filaments in parallel longitudinally over the layer of chopped fibers. After curing, the mandrel can be removed or retained within the laminate. The tubular member thus has a shell formed of longitudinal filaments which extend along the length of the laminate over a core layer of chopped fibers and an overall thickness which varies as desired.
Inventors
- 👤 R Carmody
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:03
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/08; B29C70/081; B29C41/00; B29C41/02; B29C41/08; B29C41/085; B29K; B29K2105/00; B29K2105/06; B29K2105/08; B29K2105/10; B29K2105/101; B29K2105/108; B29K2105/12; Y; Y10; Y10S; Y10S273/00; Y10S273/07; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2973; Y10T428/2975
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
62 words
A tubular laminate having a tapered portion tapering to an apex and including a shell of longitudinally disposed parallel resin impregnated filaments, said shell being of increasing radial thickness in the direction of said apex, and an inner layer of resin impregnated chopped glass fibers integrally formed within said shell, each said filament extending over the entire length of said tapered portion.
Claim 2
Dependent Claim
62 words
A tubular laminate having a tapered portion tapering to an apex and including a shell of longitudinally disposed parallel resin impregnated filaments, said shell being of increasing radial thickness in the direction of said apex, and an inner layer of resin impregnated chopped glass fibers integrally formed within said shell, each said filament extending over the entire length of said tapered portion.
Claim 3
Dependent Claim
22 words
A tubular laminate as set forth in claim 1 wherein said layer is of uniform radial thickness longitudinally of said tapered portion.
Claim 4
Dependent Claim
22 words
A tubular laminate as set forth in claim 1 wherein said layer is of decreasing thickness in the direction of said apex.
Claim 5
Dependent Claim
19 words
A tubular laminate as set forth in claim 1 wherein said chopped glass fibers are disposed within a mat.
Claim 6
Dependent Claim
37 words
A tubular laminate as set forth in claim 1 which further has a second tapered portion extending from the first tapered portion; said second tapered portion having a smaller degree of taper than said first tapered portion.
Claim 7
Dependent Claim
16 words
A tubular laminate as set forth in claim 1 having a central bore extending longitudinally therein.
Claim 8
Dependent Claim
46 words
A tubular laminate as set forth in claim 1 wherein the percentage of parallel longitudinal filaments is 5 per cent of the cross-sectional area at a point at the larger end of said tapered portion and 19.5 per cent at the apex of said tapered position.
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) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |