US3080790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color balance and exposure indicator
Assignee: Individual
•
Filing: 1958-03-17
•
Granted: 1963-03-12
•
Expires: 1978-03-17
Abstract
No abstract record available.
Inventors
- 👤 John D Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:30
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
91 words
PHOTOMULTIPLIER TUBE APPARATUS FOR MEASURING THE INTENSITY OF LIGHT, COMPRISING A PHOTOMULTIPLIER TUBE HAVING A PHOTOSENSITIVE CATHODE AND A PLURALITY OF DYNODES AND AN ANODE, THE RESISTANCES BETWEEN THE DYNODES THEREOF BEING SUBSTANTIALLY EQUAL, A FIRST ELECTRICAL POWER SOURCE CONNECTED TO SAID PHOTOMULTIPLIER TUBE ACROSS SAID PHOTOSENSITIVE CATHODE AND THE FINAL DYNODE THEREOF, A SECOND ELECTRICAL POWER SOURCE COUPLED TO SAID FIRST POWER SOURCE AT THE FINAL DYNODE OF SAID TUBE FOR SEPARATELY ENERGIZING SAID ANODE, AND MEANS FOR MEASURING ELECTRICAL CURRENT FLOW THROUGH SAID SECOND POWER SOURCE FROM SAID ANODE.
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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) | 1966-03-11 | 1966-09-10 | 1967-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-11 | 1970-09-10 | 1971-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-11 | 1974-09-10 | 1975-03-12 | $7700.00 | Window Closed / Lapsed |