Patent US3994202A successfully refreshed from Google Patents.
Patent US3123738A successfully refreshed from Google Patents.
US3123738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
oswold
Assignee: —
•
Filing: —
•
Granted: 1964-03-03
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Expires: 1981-03-03
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:20
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
AN ILLUMINATION SYSTEM FOR A RETINAL CAMERA OR THE LIKE, COMPRISING A LIGHT SOURCE INCLUDING A PAIR OF SPACED ELECTRODES AND A FILAMENT SHUNTING SAID ELECTRODES, ELECTRICAL MEANS INCLUDING A CIRCUIT AND A SOURCE OF LOW ENERGY, MEANS CONNECTING SAID ELECTRICAL MEANS TO SAID LIGHT SOURCE WHEREBY SAID ELECTRICAL MEANS ENERGIZES SAID FILAMENT TO PRODUCE ILLUMINATION OF RELATIVELY LOW INTENSITY, AND CIRCUIT MEANS INCLUDING A CAPACITOR AND A SWITCH PRODUCING AN ELECTRIC DISCHARGE ACROSS SAID PAIR OF SPACED ELECTRODES TO THEREBY PROVIDE SUFFICIENT ILLUMINATION FOR PHOTOGRAPHING THE FUNDUS OF AN EYE, SAID LAST NAMED MEANS HEATING SAID FILAMENT TO THEREBY ENHANCE THE SPECTRAL QUALITY OF THE ILLUMINATION BY INCREASING THE OUT-PUT OF LIGHT IN THE RED REGION OF THE SPECTRUM.
Claim 2
Dependent Claim
120 words
AN ILLUMINATION SYSTEM FOR A RETINAL CAMERA OR THE LIKE, COMPRISING A LIGHT SOURCE INCLUDING A PAIR OF SPACED ELECTRODES AND A FILAMENT SHUNTING SAID ELECTRODES, ELECTRICAL MEANS INCLUDING A CIRCUIT AND A SOURCE OF LOW ENERGY, MEANS CONNECTING SAID ELECTRICAL MEANS TO SAID LIGHT SOURCE WHEREBY SAID ELECTRICAL MEANS ENERGIZES SAID FILAMENT TO PRODUCE ILLUMINATION OF RELATIVELY LOW INTENSITY, AND CIRCUIT MEANS INCLUDING A CAPACITOR AND A SWITCH PRODUCING AN ELECTRIC DISCHARGE ACROSS SAID PAIR OF SPACED ELECTRODES TO THEREBY PROVIDE SUFFICIENT ILLUMINATION FOR PHOTOGRAPHING THE FUNDUS OF AN EYE, SAID LAST NAMED MEANS HEATING SAID FILAMENT TO THEREBY ENHANCE THE SPECTRAL QUALITY OF THE ILLUMINATION BY INCREASING THE OUT-PUT OF LIGHT IN THE RED REGION OF THE SPECTRUM.
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) | 1967-03-03 | 1967-09-02 | 1968-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-03 | 1971-09-02 | 1972-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-03 | 1975-09-02 | 1976-03-03 | $7700.00 | Window Closed / Lapsed |