Patent US3813571A successfully refreshed from Google Patents.
US3813571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulated cathode gun device
Assignee: Raytheon Co
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Filing: 1973-04-09
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Granted: 1974-05-28
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Expires: 1993-04-09
Abstract
Abstract A cathode gun device having an improved heat shield for greater operating efficiency is disclosed. The device includes a tubular cathode electrode, a heater electrode, a plurality of heat shields that are heat reflective, and a plurality of heat shields that are of low thermal conductivity arranged in an alternate fashion.
Inventors
- 👤 A Basiulis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:34
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/04; H01J1/00; H01J1/02; H01J1/13; H01J1/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
108 words
A cathode gun device comprising: a cathode for being heated to thermionic emission temperature; a tubular cathode support member having said cathode mounted on one end; a heater electrode being mounted within said cathode support member; a first heat shield having a heat reflective surface and having a low emissivity being mounted about the end opposite the cathode; a second heat shield having a low thermal conductivity mounted next to said first heat shield; a third heat shield substantially similar to said first heat shield being mounted next to said second heat shield; and means for securing said heat shields to each other and to said heater electrode.
Claim 2
Dependent Claim
108 words
A cathode gun device comprising: a cathode for being heated to thermionic emission temperature; a tubular cathode support member having said cathode mounted on one end; a heater electrode being mounted within said cathode support member; a first heat shield having a heat reflective surface and having a low emissivity being mounted about the end opposite the cathode; a second heat shield having a low thermal conductivity mounted next to said first heat shield; a third heat shield substantially similar to said first heat shield being mounted next to said second heat shield; and means for securing said heat shields to each other and to said heater electrode.
Claim 3
Dependent Claim
18 words
A cathode gun device according to claim 1 wherein: said second heat shieLd is a fiber metal material.
Claim 4
Dependent Claim
94 words
A cathode gun device comprising: a cathode for heating to thermionic emission temperature; a tubular cathode support member having said cathode mounted on one end; a heater electrode being mounted within said cathode support member; a first heat shield having a heat reflective surface and having a low emissivity being mounted about said cathode support member; a second heat shield being fiber metal and having a low thermal conductivity mounted next to said first heat shield; and means for securing said heat shields directly to each other and directly to said cathode support member.
Claim 5
Dependent Claim
94 words
A cathode gun device comprising: a cathode for heating to thermionic emission temperature; a tubular cathode support member having said cathode mounted on one end; a heater electrode being mounted within said cathode support member; a first heat shield having a heat reflective surface and having a low emissivity being mounted about said cathode support member; a second heat shield being fiber metal and having a low thermal conductivity mounted next to said first heat shield; and means for securing said heat shields directly to each other and directly to said cathode support member.
Claim 6
Dependent Claim
107 words
A cathode gun device comprising: a cathode for heating to thermionic emission temperature; a tubular cathode support member having said cathode mounted on one end; a heater electrode being mounted within said cathode support member; a first heat shield having a heat reflective surface and having a low emissivity being mounted about said cathode support member; a second heat shield having a low thermal conductivity mounted next to said first heat shield; a third heat shield substantially similar to said first heat shield being mounted next to said second heat shield; and means for securing said heat shields to each other and to said cathode support member.
Claim 7
Dependent Claim
107 words
A cathode gun device comprising: a cathode for heating to thermionic emission temperature; a tubular cathode support member having said cathode mounted on one end; a heater electrode being mounted within said cathode support member; a first heat shield having a heat reflective surface and having a low emissivity being mounted about said cathode support member; a second heat shield having a low thermal conductivity mounted next to said first heat shield; a third heat shield substantially similar to said first heat shield being mounted next to said second heat shield; and means for securing said heat shields to each other and to said cathode support member.
Claim 8
Dependent Claim
18 words
A cathode gun device according to claim 4 wherein: said second heat shield is a fiber metal material.
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) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |