active element in amplifier being vacuum tube

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Patents Grantslast 30 patents

Information Patent Grant
2839685
- Patent number 2,839,685
- Issue date Jun 17, 1958
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
2680197
- Patent number 2,680,197
- Issue date Jun 1, 1954
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
2611873
- Patent number 2,611,873
- Issue date Sep 23, 1952
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
2423505
- Patent number 2,423,505
- Issue date Jul 8, 1947
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
2415773
- Patent number 2,415,773
- Issue date Feb 11, 1947
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
2379694
- Patent number 2,379,694
- Issue date Jul 3, 1945
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
2343539
- Patent number 2,343,539
- Issue date Mar 7, 1944
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
2303485
- Patent number 2,303,485
- Issue date Dec 1, 1942
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
2258128
- Patent number 2,258,128
- Issue date Oct 7, 1941
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
2163403
- Patent number 2,163,403
- Issue date Jun 20, 1939
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
2031224
- Patent number 2,031,224
- Issue date Feb 18, 1936
- H03 - BASIC ELECTRONIC CIRCUITRY