Patent US4253470A successfully refreshed from Google Patents.
US4253470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Marcus-Gunn quantitator
Assignee: Individual
•
Filing: 1979-01-15
•
Granted: 1981-03-03
•
Expires: 1999-01-15
Abstract
Abstract A device for quantitating afferent optic nerve defects is disclosed. The device is particularly adapted for use in examining optic nerve defects which produce a Marcus-Gunn pupil.
Inventors
- 👤 Larry A. Sheingorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:47
CPC Classifications
A; A61; A61B; A61B3/00; A61B5/00; A61B5/16; A61B5/161; A61B5/163; A61B5/40; A61B5/4029; A61B5/4041; A61B5/4047
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
83 words
A device for quantitating afferent optic nerve defects comprising: (a) two lamps, each lamp being positioned such that each beam from each lamp is capable of being directed at a different eye of a human patient; (b) means for alternately illuminating said lamps; (c) means for independently varying the intensity of illumination of said lamps; and (d) means for independently quantitating the intensity of each lamp, comprising circuitry which samples, stores and displays a variable proportional to the illumination emitted by each lamp.
Claim 2
Independent Claim
83 words
A device for quantitating afferent optic nerve defects comprising: (a) two lamps, each lamp being positioned such that each beam from each lamp is capable of being directed at a different eye of a human patient; (b) means for alternately illuminating said lamps; (c) means for independently varying the intensity of illumination of said lamps; and (d) means for independently quantitating the intensity of each lamp, comprising circuitry which samples, stores and displays a variable proportional to the illumination emitted by each lamp.
Claim 3
Dependent Claim
66 words
The device as defined by claim 1, wherein said means (b) comprises: (i) a system clock; (ii) circuits which invert the clock signal; (iii) circuits to delay the clock and inverter signal; (iv) two bistable multivibrators which are set and reset by the clock inverter and delay signals; and (v) power amplifiers that drive the appropriate lamp in response to the state of their bistable multivibrator.
Claim 4
Dependent Claim
29 words
The device as defined by claim 1, wherein said means for independently varying the intensity of illumination of said lamps comprises a potentiometer and associated circuitry for each lamp.
Claim 5
Dependent Claim
29 words
The device as defined by claim 1, wherein said means for independently quantitating the intensity of each lamp comprises circuitry which samples and stores the current through each lamp.
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) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |