Patent US4370658A successfully refreshed from Google Patents.
Patent US3788745A successfully refreshed from Google Patents.
US3788745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for measuring range of vision
Assignee: Eltro GmbH and Co
•
Filing: 1971-12-21
•
Granted: 1974-01-29
•
Expires: 1991-12-21
Abstract
Abstract A method and apparatus is disclosed which is usable in measuring the range of vision and comprises emitting a light beam from a transmitter for reception by a distant photoelectric receiver and indication on an indicator. A diaphragm serves to alternately feed to the receiver the direct light beam from the transmitter, and the combination of the direct light beam and a dispersed beam and the intensities of the signals are compared and indicated by the indicator.
Inventors
- 👤 F Menke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:46
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/47; G01N21/49; G01N21/53; G01N21/538
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
89 words
A method of measuring range of vision through an atmosphere in which particles are distributed, said method comprising transmitting an electromagnetic beam from a first position, directly receiving a portion of the beam at a second position spaced from the first position, separately receiving at the second position a dispersed beam which is a portion of the first said beam and which is produced by particles contained in the atmosphere, and comparing the intensities of the portions to evaluate the effect of the particles in the atmosphere on vision.
Claim 2
Independent Claim
89 words
A method of measuring range of vision through an atmosphere in which particles are distributed, said method comprising transmitting an electromagnetic beam from a first position, directly receiving a portion of the beam at a second position spaced from the first position, separately receiving at the second position a dispersed beam which is a portion of the first said beam and which is produced by particles contained in the atmosphere, and comparing the intensities of the portions to evaluate the effect of the particles in the atmosphere on vision.
Claim 3
Dependent Claim
24 words
A method according to claim 1 wherein the beam is pulsed and wherein one portion is continuously received and the other portion is interrupted.
Claim 4
Dependent Claim
21 words
A method according to claim 1 wherein the portions are alternately received and converted to voltages, the resulting voltages being compared.
Claim 5
Dependent Claim
41 words
A method according to claim 3 comprising focussing the first said portion at a position intermediate the first and second positions wherefrom it is then forwarded to the second position, whereas the dispersed beam is forwarded to the second position directly.
Claim 6
Independent Claim
102 words
A method for measuring visibility through an atmosphere in which particles are distributed, said method comprising spacing and arranging an electromagnetic ray emitter and receiver so that electromagnetic rays are emitted from the emitter and received by the receiver and such that the rays emanating from the emitter and coming to the receiver consist of a direct light beam portion and a portion reflected from particles of the atmosphere and thereby constituting dispersed light, guiding both portions to a common receiving zone in said receiver directly but alternately, and photoelectrically receiving the thusly alternating portions to effect a comparison of the same.
Claim 7
Independent Claim
102 words
A method for measuring visibility through an atmosphere in which particles are distributed, said method comprising spacing and arranging an electromagnetic ray emitter and receiver so that electromagnetic rays are emitted from the emitter and received by the receiver and such that the rays emanating from the emitter and coming to the receiver consist of a direct light beam portion and a portion reflected from particles of the atmosphere and thereby constituting dispersed light, guiding both portions to a common receiving zone in said receiver directly but alternately, and photoelectrically receiving the thusly alternating portions to effect a comparison of the same.
Claim 8
Dependent Claim
34 words
A method according to claim 5, wherein the first said portion is received by the receiver alternately by itself and together with the dispersed light resulting from the particles contained in the atmosphere, respectively.
References Cited (Backward Citations)
GB983931A
Cited
GB1022462A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |