US3346752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron multiplier dynode having an aperture of reduced secondary emission
Assignee: RCA Corp
•
Filing: 1965-04-27
•
Granted: 1967-10-10
•
Expires: 1985-04-27
Abstract
No abstract record available.
Inventors
- 👤 Donald F Battson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:16
CPC Classifications
H; H01; H01J; H01J43/00; H01J43/04; H01J43/06; H01J43/10; H01J29/00; H01J29/02; H01J29/023; H01J31/00; H01J31/08; H01J31/26; H01J31/28; H01J31/34; H01J31/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
AN ELECTRON MULTIPLIER TUBE HAVING: (A) A FIRST DYNODE, (B) SAID FIRST DYNODE HAVING WALLS DEFINING AN APERTURE THEREIN, (C) A CATHODE HAVING AN ELECTRON EMISSIVE COATING THEREON DISPOSED RELATIVELY CLOSED TO AND IN AXIAL REGISTER WITH SAID APERTURE, WHEREBY SOME OF THE MATERIAL OF SAID ELECTRON EMISSIVE COATING IS UNDESIRABLY DEPOSITED ON SAID WALLS DURING FORMATION OF SAID CATHODE, (D) SAID WALLS HAVING THEREON A COATING OF A MATERIAL COMPRISING A CHEMICAL COMPOUND OF AN ORGANIC MATERIAL AND A PORTION OF SAID EMISSIVE MATERIAL DEPOSITED ON SAID WALLS, SAID COMPOUND HAVING A SECONDARY ELECTRON EMISSION RATIO LESS THAN ONE.
Claim 2
Dependent Claim
100 words
AN ELECTRON MULTIPLIER TUBE HAVING: (A) A FIRST DYNODE, (B) SAID FIRST DYNODE HAVING WALLS DEFINING AN APERTURE THEREIN, (C) A CATHODE HAVING AN ELECTRON EMISSIVE COATING THEREON DISPOSED RELATIVELY CLOSED TO AND IN AXIAL REGISTER WITH SAID APERTURE, WHEREBY SOME OF THE MATERIAL OF SAID ELECTRON EMISSIVE COATING IS UNDESIRABLY DEPOSITED ON SAID WALLS DURING FORMATION OF SAID CATHODE, (D) SAID WALLS HAVING THEREON A COATING OF A MATERIAL COMPRISING A CHEMICAL COMPOUND OF AN ORGANIC MATERIAL AND A PORTION OF SAID EMISSIVE MATERIAL DEPOSITED ON SAID WALLS, SAID COMPOUND HAVING A SECONDARY ELECTRON EMISSION RATIO LESS THAN ONE.
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) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |