Patent US4067391A successfully refreshed from Google Patents.
Patent US3635256A successfully refreshed from Google Patents.
US3635256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wear-resistant tube
Assignee: Universal Oil Products Co
•
Filing: 1970-03-02
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Granted: 1972-01-18
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Expires: 1990-03-02
Abstract
Abstract A wear-resistant tube having a smooth inner wall and constructed of layers of helically wound glass filaments and finely divided particles of copper at the surface of the smooth inner wall bonded together in a thermosetting resin system.
Inventors
- 👤 Jack Lowrie Mclarty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:52
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/12; F16L9/133; F16L9/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
36 words
The tube of claim 1 further characterized in that an interior gel coat layer of an inner resin matrix forms said inner wall, and said particles of copper are uniformly distributed throughout said gel coat layer.
Claim 2
Dependent Claim
20 words
The tube of claim 1 further characterized in that said particles of copper are uniformly distributed throughout said resin system.
Claim 3
Dependent Claim
34 words
The tube of claim 1 further characterized in that an inner layer of helically wound glass filaments is formed by a filament wound at a helical pitch equal to the diameter of said filament.
Claim 4
Dependent Claim
39 words
The tube of claim 1 further characterized in that an inner layer of helically wound glass filaments is formed by a band of filaments wound at a helical pitch no greater than the width of said band of filaments.
Claim 5
Dependent Claim
22 words
The tube of claim 1 further characterized in that said particles of copper are concentrated near the inner wall of said tube.
Claim 6
Dependent Claim
51 words
A tube having a wear-resistant inner surface comprising an interior gel coat layer of a first thermosetting resin system in which finely ground copper particles are dispersed, and an exterior layer of glass filaments bonded together in a second thermosetting resin system and overwound about and bonded to said interior layer.
Claim 7
Dependent Claim
28 words
The tube of claim 7 further characterized in that said first thermosetting resin system used in said gel coat layer is a polyester resin and a hardening agent.
Claim 8
Dependent Claim
28 words
The tube of claim 7 further characterized in that said first thermosetting resin system used in said gel coat layer is an epoxy resin and a hardening agent.
Claim 9
Dependent Claim
27 words
The tube of claim 7 further characterized in that said second thermosetting resin system used in said exterior layer is a polyester resin and a hardening agent.
Claim 10
Dependent Claim
27 words
The tube of claim 7 further characterized in that said second thermosetting resin system used in said exterior layer is an epoxy resin and a hardening agent.
Claim 11
Dependent Claim
48 words
In a wear-resistant tube having a smooth inner wall and having layers of helically wound glass filaments bonded together in a thermosetting resin system, the improvement comprising a smooth inner wall formed of a thermosetting resin matrix containing finely divided particles of copper held in said resin matrix.
References Cited (Backward Citations)
US2884010A
Cited
US3286737A
Cited
US3523079A
Cited
US3451433A
Cited
US3530068A
Cited
US3481369A
Cited
US3523078A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |