US3294975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photo-device with segmented photocathode
Assignee: Electro Mechanical Research Inc
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Filing: 1962-11-01
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Granted: 1966-12-27
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Expires: 1982-11-01
Abstract
No abstract record available.
Inventors
- 👤 Horst G Fleck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:40
CPC Classifications
H; H01; H01J; H01J43/00; H01J43/04; H01J43/06; H01J43/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
96 words
A PHOTOMULTIPLIER TUBE HAVING A PHOTOCATHODE PORTION AND A DYNODE PORTION; SAID PHOTOCATHODE PORTION COMPRISING A HEAD, A NECK JOINING SAID HEAD WITH SAID DYNODE PORTION, A WINDOW FORMED OF TRANSPARENT MATERIAL, AN ELECTRICALLY INSULATING MEMBER SUPPORTING SAID WINDOW WITHIN SAID HEAD, A PLURALITY OF SLOTS CUT THROUGH SAID WINDOW TO DIVIDE SAID WINDOW INTO A PLURALITY OF SEGMENTS; SAID SLOTS EXTENDING A SUBSTANTIAL DISTANCE INTO SAID INSULATING MEMBER; PHOTOEMISSIVE MEANS DISPOSED ON EACH OF SAID SEGMENTS; AND MEANS FOR SELECTIVELY AND INDEPENDENTLY CONNECTING THE PHOTOEMISSIVE MEANS ON EACH OF SAID SEGMENTS TO AN ENERGIZING CIRCUIT.
References Cited (Backward Citations)
US1889431A
Cited
US1870596A
Cited
US2227095A
Cited
US2244318A
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US2410115A
Cited
US2492148A
Cited
US2821637A
Cited
US2922216A
Cited
US2943382A
Cited
US3068360A
Cited
US3202853A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |