FR971273A - Improvements to sound detectors - Google Patents
Improvements to sound detectorsInfo
- Publication number
- FR971273A FR971273A FR971273DA FR971273A FR 971273 A FR971273 A FR 971273A FR 971273D A FR971273D A FR 971273DA FR 971273 A FR971273 A FR 971273A
- Authority
- FR
- France
- Prior art keywords
- sound detectors
- detectors
- sound
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/72—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using ultrasonic, sonic or infrasonic waves
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR56745T | 1947-03-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR971273A true FR971273A (en) | 1951-01-15 |
Family
ID=8690902
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR971273D Expired FR971273A (en) | 1947-03-22 | 1940-03-13 | Improvements to sound detectors |
FR56745D Expired FR56745E (en) | 1947-03-22 | 1947-03-22 | Improvements to sound detectors |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR56745D Expired FR56745E (en) | 1947-03-22 | 1947-03-22 | Improvements to sound detectors |
Country Status (1)
Country | Link |
---|---|
FR (2) | FR971273A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3243525A (en) * | 1962-11-13 | 1966-03-29 | Eaton Arthur | Hearing intensifying and directing apparatus |
-
1940
- 1940-03-13 FR FR971273D patent/FR971273A/en not_active Expired
-
1947
- 1947-03-22 FR FR56745D patent/FR56745E/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3243525A (en) * | 1962-11-13 | 1966-03-29 | Eaton Arthur | Hearing intensifying and directing apparatus |
Also Published As
Publication number | Publication date |
---|---|
FR56745E (en) | 1952-10-03 |
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