US3847487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant effective slot length light pipe
Assignee: Elsag Bailey Inc
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Filing: 1973-04-09
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Granted: 1974-11-12
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Expires: 1993-04-09
Abstract
Abstract A light pipe producing an in-situ, dimensionally stable, sample of a flowing fluid in which a support pipe is provided with a slot through which the fluid flows. Purge fluid is discharged into the sampled fluid through orifices located at each end of the slot.
Inventors
- 👤 R Boll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:15
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/01; G01N21/15
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
In a light pipe for producing an in-situ, dimensionally stable, flowing sample of a fluid, the combination comprising: a support pipe having an elongated slot through which the fluid sample flows, means for admitting purge fluid into said support pipe between each end of said slot and the adjacent outer end of said support pipe, and a disc closing said support pipe at each end of said slot provided with an orifice tube having a length at least twice the diameter of the orifice through which the purge fluid is discharged into the fluid flowing through said slot, thereby producing an orderly flow of purge fluid into said flowing fluid and a dimensionally stable sample of the flowing fluid.
Claim 2
Dependent Claim
119 words
In a light pipe for producing an in-situ, dimensionally stable, flowing sample of a fluid, the combination comprising: a support pipe having an elongated slot through which the fluid sample flows, means for admitting purge fluid into said support pipe between each end of said slot and the adjacent outer end of said support pipe, and a disc closing said support pipe at each end of said slot provided with an orifice tube having a length at least twice the diameter of the orifice through which the purge fluid is discharged into the fluid flowing through said slot, thereby producing an orderly flow of purge fluid into said flowing fluid and a dimensionally stable sample of the flowing fluid.
Claim 3
Dependent Claim
70 words
A light pipe as set forth in claim 1 further including means for maintaining a constant rate of flow of a compressible gas purge fluid comprising, a source of purge fluid under pressure, a conduit for transmitting purge fluid from said source into said support pipe, an orifice disposed within said conduit, and means for maintaining a constant pressure on the inlet side of said orifice above the critical pressure.
Claim 4
Dependent Claim
31 words
A light pipe as set forth in claim 1 further including a flat reinforcing plate on each longitudinal side of said slot running from substantially end to end of said slot.
Claim 5
Dependent Claim
28 words
A light pipe as set forth in claim 1 wherein said slot is divided into a plurality of segments to thereby increase the rigidity of said support pipe.
Claim 6
Dependent Claim
34 words
A light pipe as set forth in claim 1 wherein the face of each of said orifice plates adjacent the flowing fluid is tapered relative to the direction of flow of said flowing fluid.
Claim 7
Dependent Claim
45 words
A light pipe as set forth in claim 1 further including means controlling the rate of flow of purge fluid through said orifice to maintain a stable inter face between the purge fluid introduced into said slot and the flowing fluid passing through said slot.
Claim 8
Dependent Claim
33 words
A light pipe as set forth in claim 1 further including means to maintain a purge flow rate through each of said orifices greater than approximately 2.5 scfm per inch of orifice diameter.
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) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |