US4114420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Environmental test chamber system
Assignee: United States Department of the Air Force
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Filing: 1977-09-12
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Granted: 1978-09-19
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Expires: 1997-09-12
Abstract
Abstract A test apparatus comprising an elongated, heat-resistant glass tube, the ends of which are firmly seated in top and bottom end-caps. A plurality of threaded rods extending through the top and bottom end-caps parallel to the glass tube and having nuts threaded on their ends provides means for holding the end-caps in place. The top end-cap has two threaded ports to which fluid inlet and outlet lines are attached while its interior surfaces has an attachment means for supporting a test specimen within the glass tube. The test apparatus is particularly suitable for performing tests on polymeric film or composites under different environmental conditions.
Inventors
- 👤 Charles E. Browning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:25
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/08; G01N3/18; G01N3/14; G01N2203/00; G01N2203/003; G01N2203/0032; G01N2203/0033; G01N2203/0058; G01N2203/0069; G01N2203/0071
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
377 words
A test apparatus for determining the ability of a polymeric material to perform under load in various environments at high temperatures over given periods of time which comprises a top end-cap composed of a flange attached to a downwardly extending cylindrical member, the flange having holes formed therein around it periphery and the cylindrical member having a first groove formed in and extending around its inner wall; a first O-ring positioned in the first groove; a fastener attached to the lower surface of the flange at a location in the center of the circle formed by the intersection of the flange with the cylindrical member; a bottom end-cap composed of a flange attached to an upwardly extending cylindrical member, the flange having holes formed therein around its periphery and the cylindrical member having a second groove formed therein and extending around its inner wall; a second O-ring positioned in the second groove; an elongated, heat-resistant glass tube vertically disposed and having one of its ends positioned in the cylindrical member of the top end-cap so that its upper edge is in contact with the lower surface of the flange of the top end-cap and its surface is in contact with the first O-ring and having the other of its ends positioned in the cylindrical member of the bottom end-cap so that its lower edge is in contact with the upper surface of the flange of the bottom end-cap and its surface is in contact with the second O-ring; a first wire having one of its ends attached to the fastener and vertically disposed in the tube; one end of a test specimen attached to the other end of the first wire and suspended above the level of water present in the tube; a second wire having one of its ends attached to the other end of the test specimen; a weight attached to the other end of the second wire; inlet and outlet ports formed in the flange of the top end-cap and leading into the chamber formed by the tube and the top and bottom end-caps; tie rods having threaded ends extending through corresponding, vertically aligned holes of the flanges; and nuts threaded onto the ends of the tie rods and tightened against the flange surfaces.
Claim 2
Dependent Claim
377 words
A test apparatus for determining the ability of a polymeric material to perform under load in various environments at high temperatures over given periods of time which comprises a top end-cap composed of a flange attached to a downwardly extending cylindrical member, the flange having holes formed therein around it periphery and the cylindrical member having a first groove formed in and extending around its inner wall; a first O-ring positioned in the first groove; a fastener attached to the lower surface of the flange at a location in the center of the circle formed by the intersection of the flange with the cylindrical member; a bottom end-cap composed of a flange attached to an upwardly extending cylindrical member, the flange having holes formed therein around its periphery and the cylindrical member having a second groove formed therein and extending around its inner wall; a second O-ring positioned in the second groove; an elongated, heat-resistant glass tube vertically disposed and having one of its ends positioned in the cylindrical member of the top end-cap so that its upper edge is in contact with the lower surface of the flange of the top end-cap and its surface is in contact with the first O-ring and having the other of its ends positioned in the cylindrical member of the bottom end-cap so that its lower edge is in contact with the upper surface of the flange of the bottom end-cap and its surface is in contact with the second O-ring; a first wire having one of its ends attached to the fastener and vertically disposed in the tube; one end of a test specimen attached to the other end of the first wire and suspended above the level of water present in the tube; a second wire having one of its ends attached to the other end of the test specimen; a weight attached to the other end of the second wire; inlet and outlet ports formed in the flange of the top end-cap and leading into the chamber formed by the tube and the top and bottom end-caps; tie rods having threaded ends extending through corresponding, vertically aligned holes of the flanges; and nuts threaded onto the ends of the tie rods and tightened against the flange surfaces.
Claim 3
Dependent Claim
20 words
The test apparatus according to claim 1 in which the test specimen is immersed in water present in the tube.
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) | 1981-09-18 | 1982-03-20 | 1982-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-18 | 1986-03-20 | 1986-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-18 | 1990-03-20 | 1990-09-19 | $7700.00 | Window Closed / Lapsed |