US4324460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for testing flicker fusion frequency
Assignee: Individual
•
Filing: 1980-04-18
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Granted: 1982-04-13
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Expires: 2000-04-18
Abstract
Abstract Apparatus for testing temporal vision including a target light produced on a portion of a viewing area. A boundary is provided between the target light and a background light, such being produced on substantially all of the viewing area. A first oscillator switches the target light on and off while a second oscillator is available to switch the background light on and off. A frequency control is provided to vary the rate of switching of the target light.
Inventors
- 👤 Michael L. Daley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:35
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/16; A61B5/161
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
140 words
Apparatus for testing temporal vision comprising, a viewing area, means for producing a target light on a portion of said area, means for producing background light on substantially all of said area, target-defining means for defining a boundary which provides a viewably distinct separation between said target light and said background light, first oscillator means operatively connected to said target-light producing means, said oscillator means being operative to switch said target light between a condition of full illumination and a condition of no illumination, second oscillator means operatively connected to said background-light producing means, said second oscillator means being operative to switch said background light between a condition of full illumination and a condition of no illumination, and a frequency control, operatively connected to said first oscillator means, operative to selectively vary the rate of switching of said target light.
Claim 2
Dependent Claim
140 words
Apparatus for testing temporal vision comprising, a viewing area, means for producing a target light on a portion of said area, means for producing background light on substantially all of said area, target-defining means for defining a boundary which provides a viewably distinct separation between said target light and said background light, first oscillator means operatively connected to said target-light producing means, said oscillator means being operative to switch said target light between a condition of full illumination and a condition of no illumination, second oscillator means operatively connected to said background-light producing means, said second oscillator means being operative to switch said background light between a condition of full illumination and a condition of no illumination, and a frequency control, operatively connected to said first oscillator means, operative to selectively vary the rate of switching of said target light.
Claim 3
Dependent Claim
21 words
The apparatus of claim 1 which further includes means for positioning a colored filter in the path of such person's view.
Claim 4
Independent Claim
97 words
A method for testing a person's temporal vision comprising the steps of, producing a target light on a portion of a viewing area viewed by the person, producing a background light on substantially all of said area, providing a defined boundary for creating a viewably distinct separation between said target light and said background light, switching said target light between a condition of full illumination and a condition of no illumination, switching said background light between a condition of full illumination and a condition of no illumination, and varying the rate of switching of said target light.
Claim 5
Independent Claim
97 words
A method for testing a person's temporal vision comprising the steps of, producing a target light on a portion of a viewing area viewed by the person, producing a background light on substantially all of said area, providing a defined boundary for creating a viewably distinct separation between said target light and said background light, switching said target light between a condition of full illumination and a condition of no illumination, switching said background light between a condition of full illumination and a condition of no illumination, and varying the rate of switching of said target light.
Claim 6
Dependent Claim
22 words
The method of claim 3 which further includes the step of positioning a colored filter in the path of such person's view.
References Cited (Backward Citations)
US3424519A
Cited
US3814510A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-12 | 1985-10-12 | 1986-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-12 | 1989-10-12 | 1990-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-12 | 1993-10-12 | 1994-04-13 | $7700.00 | Window Closed / Lapsed |