Patent US3604252A successfully refreshed from Google Patents.
US3604252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interferometric system for measuring physical condition of a medium
Assignee: Pitney Bowes Inc
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Filing: 1970-02-16
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Granted: 1971-09-14
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Expires: 1990-02-16
Abstract
Abstract An acoustical interferometric system that includes two effective sources of ultrasonic radiation for establishing a normal pattern of interference fringes, the radiation from one of said sources passing through a fluid medium that is subject to physical changes, such as temperature and/or density changes, whereby such changes can be effectively sensed by detecting means that are sensitive to shifts in the pattern of interference fringes; such shift being caused by variations in the speed at which the acoustical radiation is conducted through said medium, the speed variations resulting from the said physical changes.
Inventors
- 👤 Basil B Beeken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:02
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/02; G01N29/024
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
131 words
An acoustical interferometric sensing system comprising: whistle means adapted to generate high frequency acoustical waves; means for directing said acoustical waves along two separate paths and thereafter causing said waves to mutually interfere with one another so as to establish a pattern of acoustical interference fringe lines; conduit means disposed along one of said paths and arranged to permit at least some of said waves to pass through a sample medium whose density is to be sensed; a turbulence-type amplifier having a control port; and mounting means for said turbulence-type amplifier and adapted to position said amplifier so that said control port may be effectively disposed along one of said acoustical fringe lines whereby said turbulence amplifier is adapted to be controlled in accordance with the location of said fringe line.
Claim 2
Dependent Claim
131 words
An acoustical interferometric sensing system comprising: whistle means adapted to generate high frequency acoustical waves; means for directing said acoustical waves along two separate paths and thereafter causing said waves to mutually interfere with one another so as to establish a pattern of acoustical interference fringe lines; conduit means disposed along one of said paths and arranged to permit at least some of said waves to pass through a sample medium whose density is to be sensed; a turbulence-type amplifier having a control port; and mounting means for said turbulence-type amplifier and adapted to position said amplifier so that said control port may be effectively disposed along one of said acoustical fringe lines whereby said turbulence amplifier is adapted to be controlled in accordance with the location of said fringe line.
Claim 3
Dependent Claim
15 words
Apparatus as defined by claim 1: additionally comprising heating means for heating said sample medium.
Claim 4
Dependent Claim
20 words
Apparatus as defined by claim 1 whereiN said conduit means includes a chamber through which said sample medium may flow.
Claim 5
Dependent Claim
15 words
Apparatus as defined by claim 1 wherein said conduit means includes flexible wave transmitting diaphragms.
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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |