US3209153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for compensating dark current in photoelectric devices
Assignee: Ernst Leitz Wetzlar GmbH
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Filing: 1961-07-05
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Granted: 1965-09-28
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Expires: 1981-07-05
Abstract
No abstract record available.
Inventors
- 👤 Frenk Helmuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:05
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42; G01J1/44; G01J1/46; H; H01; H01J; H01J43/00; H01J43/04; H01J43/30
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
57 words
AN ARRANGEMENT FOR COMPENSATING FOR DARK CURRENT IN AN INTEGRATOR FOR PHOTOELECTRIC CURRENT AND COMPRISING A PHOTOMULTIPLIER TUBE, A VOLTAGE LEVEL SENSITIVE SWITCHING DEVICE CONNECTED TO SAID TUBE, A CHARGING CAPACITOR CONNECTED IN SERIES BETWEEN THE ANODE OF SAID TUBE AND SAID VOLTAGE LEVEL SENSITIVE SWITCHING DEVICE, AN RC-CIRCUIT CONNECTING SAID CAPACITOR WITH A POSITIVE POTENTIAL WHICH
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) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |