US3283203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-ray tube temperature enhanced field emission cathode
Assignee: Field Emission Corp
•
Filing: 1961-12-19
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Granted: 1966-11-01
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Expires: 1981-12-19
Abstract
No abstract record available.
Inventors
- 👤 Walter P Dyke
- 👤 Frank J Grundhauser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:07
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
AN X-RAY TUBE COMPRISING: AN EVACUATED ENVELOPE, AN ELONGAED CONICAL ANODE SUPPORTED IN SAID ENVELOPE, ANODE CONNECTOR MEANS EXTENDING TO THE EXTERIOR OF SAID ENVELOPE, A COMBINED FIELD EMISSION AND THERMAL EMISSION CATHODE STRUCTURE SUPPORTED IN SAID ENVELOPE AND SURROUNDING SAID ANODE, SAID CATHODE STRUCTURE INCLUDING A PLURALITY OF UNCOILED FILAMENT WIRES POSITIONED AROUND SAID ANODE AND
Claim 2
Dependent Claim
57 words
AN X-RAY TUBE COMPRISING: AN EVACUATED ENVELOPE, AN ELONGAED CONICAL ANODE SUPPORTED IN SAID ENVELOPE, ANODE CONNECTOR MEANS EXTENDING TO THE EXTERIOR OF SAID ENVELOPE, A COMBINED FIELD EMISSION AND THERMAL EMISSION CATHODE STRUCTURE SUPPORTED IN SAID ENVELOPE AND SURROUNDING SAID ANODE, SAID CATHODE STRUCTURE INCLUDING A PLURALITY OF UNCOILED FILAMENT WIRES POSITIONED AROUND SAID ANODE AND
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) | 1969-10-31 | 1970-05-02 | 1970-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-31 | 1974-05-02 | 1974-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-31 | 1978-05-02 | 1978-11-01 | $7700.00 | Window Closed / Lapsed |