US4013102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite tubing
Assignee: WR Grace and Co
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Filing: 1975-01-30
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Granted: 1977-03-22
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Expires: 1995-01-30
Abstract
Abstract The invention relates to the fabrication of composite rigid tubular structures which include a rigidified tubular core member, an initially open-cell resilient foam material helically wrapped about the core member, a layer of reinforcing elements helically wrapped about and radially compressing said foam material, and a thermoset resinous matrix filling the compressed open-cells of said foam material and encapsulating said reinforcing elements.
Inventors
- 👤 John Z. DeLorean
- 👤 Chauncey L. Dirks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:04
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/16; F16L59/00; F16L59/02; F16L59/027; Y; Y10; Y10S; Y10S138/00; Y10S138/02; Y10S138/07
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
54 words
A composite rigid tubular structure comprising a rigidified tubular core member, a substantially compressed initially open-cell resilient foam material helically wrapped about said core element, a layer of reinforcing elements helically wrapped about said foam material, and a thermoset resinous matrix filling the compressed open-cells of said foam material and encapsulating said reinforcing elements.
Claim 2
Dependent Claim
54 words
A composite rigid tubular structure comprising a rigidified tubular core member, a substantially compressed initially open-cell resilient foam material helically wrapped about said core element, a layer of reinforcing elements helically wrapped about said foam material, and a thermoset resinous matrix filling the compressed open-cells of said foam material and encapsulating said reinforcing elements.
Claim 3
Dependent Claim
29 words
A composite rigid tubular structure as set forth in claim 1 in which said layer of reinforcing elements is comprised of a plurality of adjacently disposed unidirectional fiberglass filaments.
Claim 4
Dependent Claim
80 words
A composite tubular structure comprising a rigidified tubular core member, a first layer of reinforcing elements helically laid about said tubular core member, a second layer of a substantially compressed initially resilient open-cell foam material helically laid about said first layer, and a third layer of reinforcing elements helically wrapped about said second layer of foam material, and a thermoset resin matrix filling the compressed open-cells of said foam material and encapsulating said first and third layers of reinforcing elements.
Claim 5
Dependent Claim
80 words
A composite tubular structure comprising a rigidified tubular core member, a first layer of reinforcing elements helically laid about said tubular core member, a second layer of a substantially compressed initially resilient open-cell foam material helically laid about said first layer, and a third layer of reinforcing elements helically wrapped about said second layer of foam material, and a thermoset resin matrix filling the compressed open-cells of said foam material and encapsulating said first and third layers of reinforcing elements.
Claim 6
Dependent Claim
31 words
A composite tubular structure as set forth in claim 3 in which said first and third layers of reinforcing elements is comprised of a plurality of adjacently disposed unidirectional fiberglass filaments.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |