US3149968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for correcting sensitivity variations in photomultiplier tubes
Assignee: Individual
•
Filing: 1960-12-21
•
Granted: 1964-09-22
•
Expires: 1980-12-21
Abstract
No abstract record available.
Inventors
- 👤 Lloyd D Stephens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:03
CPC Classifications
H; H01; H01J; H01J43/00; H01J43/04; H01J43/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
IN A METHOD OF PREPARING A CORRECTIVE FILTER OF PHOTOGRAPHIC FILM FOR USE ON THE DETECTING SURFACE OF A PHOTOSENSITIVE DEVICE WHICH DISPLAYS A NON-UNIFORM SENSITIVITY, THE STEPS COMPRISING SCANNING THE PHOTOCATHODE SURFACE OF SAID DEVICE WITH A FIRST ESSENTIALLY POINT SOURCE OF LIGHT OF CONSTANT INTENSITY TO PRODUCE OUTPUT SIGNALS THEREFROM INDICATIVE OF THE CHARACTERISTIC VARIATIONS IN SENSTIVITY OF SAID DEVICE, SCANNING THE SURFACE OF SAID PHOTOGRAPHIC FILM WITH A SECOND ESSENTIALLY POINT SOURCE OF LIGHT, REGULATING THE INTENSITY OF SAID SECOND SOURCE OF LIGHT BY SAID OUTPUT SIGNALS DURING SAID SCANNING OF SAID FILM, AND DEVELOPING SAID FILM WHEREBY A VARYING DEGREE OF OPACITY IS OBTAINED AT EACH POINT ON SAID FILM WHICH DEGREE OF OPACITY OS PROPORTIONAL TO THE RESPONSE OF SAID DEVICE AT A CORRESPONDING POINT ON SAID POTOCATHODE SURFACE.
Claim 2
Dependent Claim
134 words
IN A METHOD OF PREPARING A CORRECTIVE FILTER OF PHOTOGRAPHIC FILM FOR USE ON THE DETECTING SURFACE OF A PHOTOSENSITIVE DEVICE WHICH DISPLAYS A NON-UNIFORM SENSITIVITY, THE STEPS COMPRISING SCANNING THE PHOTOCATHODE SURFACE OF SAID DEVICE WITH A FIRST ESSENTIALLY POINT SOURCE OF LIGHT OF CONSTANT INTENSITY TO PRODUCE OUTPUT SIGNALS THEREFROM INDICATIVE OF THE CHARACTERISTIC VARIATIONS IN SENSTIVITY OF SAID DEVICE, SCANNING THE SURFACE OF SAID PHOTOGRAPHIC FILM WITH A SECOND ESSENTIALLY POINT SOURCE OF LIGHT, REGULATING THE INTENSITY OF SAID SECOND SOURCE OF LIGHT BY SAID OUTPUT SIGNALS DURING SAID SCANNING OF SAID FILM, AND DEVELOPING SAID FILM WHEREBY A VARYING DEGREE OF OPACITY IS OBTAINED AT EACH POINT ON SAID FILM WHICH DEGREE OF OPACITY OS PROPORTIONAL TO THE RESPONSE OF SAID DEVICE AT A CORRESPONDING POINT ON SAID POTOCATHODE SURFACE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-22 | 1968-03-23 | 1968-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-22 | 1972-03-23 | 1972-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-22 | 1976-03-23 | 1976-09-22 | $7700.00 | Window Closed / Lapsed |