David A. Krohn

Person

Milford, CT, US

People

Patents Grantslast 30 patents

Information Patent Grant
Optical fiber element having a permanent protective coating with a...
- Patent number RE36146
- Issue date Mar 16, 1999
- Minnesota Mining and Manufacturing Company
- James Craig Novack
- 385 - Optical waveguides
Information Patent Grant
Optical fiber element having a permanent protective coating with a...
- Patent number 5,381,504
- Issue date Jan 10, 1995
- Minnesota Mining and Manufacturing Company
- James C. Novack
- G02 - OPTICS
Information Patent Grant
Low loss infrared transmitting hollow core optical fiber method of...
- Patent number 5,221,308
- Issue date Jun 22, 1993
- 3M
- David A. Krohn
- G02 - OPTICS
Information Patent Grant
Fiber optic displacement measuring apparatus
- Patent number 5,073,027
- Issue date Dec 17, 1991
- 3M Fiber Optic Products, Inc.
- David A. Krohn
- G02 - OPTICS
Information Patent Grant
Precision optoelectronic rotational position sensor
- Patent number 4,703,309
- Issue date Oct 27, 1987
- Eotec Corporation
- David A. Krohn
- G01 - MEASURING TESTING
Information Patent Grant
Optoelectronic rotational position sensor
- Patent number 4,698,616
- Issue date Oct 6, 1987
- Eotec Corp
- David A. Krohn
- G01 - MEASURING TESTING
Information Patent Grant
Optoelectronic rotational position sensor
- Patent number 4,679,029
- Issue date Jul 7, 1987
- Eotec Corporation
- David A. Krohn
- G01 - MEASURING TESTING
Information Patent Grant
Liquid level sensor
- Patent number 4,606,226
- Issue date Aug 19, 1986
- Eotec Corporation
- David A. Krohn
- G01 - MEASURING TESTING
Information Patent Grant
Method and components for remote reading of utility meters
- Patent number 4,500,870
- Issue date Feb 19, 1985
- Eotec Corporation
- David A. Krohn
- G01 - MEASURING TESTING
Information Patent Grant
Low loss optical fibers
- Patent number 4,289,516
- Issue date Sep 15, 1981
- Eotec Corporation
- David A. Krohn
- C03 - GLASS MINERAL OR SLAG WOOL
Information Patent Grant
Method of manufacture of optical fiber
- Patent number 4,277,270
- Issue date Jul 7, 1981
- Eotec Corporation
- David A. Krohn
- C03 - GLASS MINERAL OR SLAG WOOL
Information Patent Grant
Method of manufacturing graded index optical fibers
- Patent number 4,277,271
- Issue date Jul 7, 1981
- Eotec Corporation
- David A. Krohn
- C03 - GLASS MINERAL OR SLAG WOOL
Information Patent Grant
Sealing glass
- Patent number 4,273,585
- Issue date Jun 16, 1981
- Exxon Research and Engineering Co.
- David A. Krohn
- C03 - GLASS MINERAL OR SLAG WOOL
Information Patent Grant
Method of manufacturing graded index optical fibers
- Patent number 4,163,654
- Issue date Aug 7, 1979
- Exxon Research and Engineering Co.
- David A. Krohn
- C03 - GLASS MINERAL OR SLAG WOOL
Information Patent Grant
Preparation of photochromic gradient lenses
- Patent number 4,155,734
- Issue date May 22, 1979
- American Optical Corporation
- David A. Krohn
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Photochromic gradient lenses
- Patent number 4,101,302
- Issue date Jul 18, 1978
- American Optical Corporation
- David A. Krohn
- C03 - GLASS MINERAL OR SLAG WOOL
Information Patent Grant
Preparation of photochromic gradient lenses of cosmetically improve...
- Patent number 4,080,051
- Issue date Mar 21, 1978
- American Optical Corporation
- David A. Krohn
- G02 - OPTICS
Information Patent Grant
Preparation of photochromic gradient lenses of improved color
- Patent number 4,076,395
- Issue date Feb 28, 1978
- American Optical Corporation
- Emil W. Deeg
- G02 - OPTICS
Information Patent Grant
Ophthalmic lens with locally variable index of refraction and metho...
- Patent number 4,073,579
- Issue date Feb 14, 1978
- American Optical Corporation
- Emil W. Deeg
- G02 - OPTICS
Information Patent Grant
High strength ophthalmic lens
- Patent number 4,042,405
- Issue date Aug 16, 1977
- American Optical Corporation
- David A. Krohn
- C03 - GLASS MINERAL OR SLAG WOOL
Information Patent Grant
Heat treatment method for making photochromic gradient lenses
- Patent number 4,036,624
- Issue date Jul 19, 1977
- American Optical Corporation
- David A. Krohn
- C03 - GLASS MINERAL OR SLAG WOOL
Information Patent Grant
Method of making artificial intraocular lenses with holes
- Patent number 4,028,082
- Issue date Jun 7, 1977
- American Optical Corporation
- David A. Krohn
- C03 - GLASS MINERAL OR SLAG WOOL
Information Patent Grant
Method of making artificial intraocular lenses with holes
- Patent number 4,015,965
- Issue date Apr 5, 1977
- American Optical Corporation
- Emil W. Deeg
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
High strength ophthalmic lens
- Patent number 4,012,131
- Issue date Mar 15, 1977
- American Optical Corporation
- David A. Krohn
- C03 - GLASS MINERAL OR SLAG WOOL
Information Patent Grant
Artificial intraocular lens
- Patent number 3,996,627
- Issue date Dec 14, 1976
- American Optical Corporation
- Emil W. Deeg
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Ion exchangeable segment glass
- Patent number 3,997,249
- Issue date Dec 14, 1976
- American Optical Corporation
- David A. Krohn
- G02 - OPTICS
Information Patent Grant
High strength ophthalmic lens
- Patent number 3,997,250
- Issue date Dec 14, 1976
- American Optical Corporation
- David A. Krohn
- C03 - GLASS MINERAL OR SLAG WOOL
Information Patent Grant
Faraday rotation glasses
- Patent number 3,935,020
- Issue date Jan 27, 1976
- American Optical Corporation
- Emil W. Deeg
- C03 - GLASS MINERAL OR SLAG WOOL

David A. Krohn

Person

Patents Grantslast 30 patents

Optical fiber element having a permanent protective coating with a...

Optical fiber element having a permanent protective coating with a...

Low loss infrared transmitting hollow core optical fiber method of...

Fiber optic displacement measuring apparatus

Precision optoelectronic rotational position sensor

Optoelectronic rotational position sensor

Optoelectronic rotational position sensor

Liquid level sensor

Method and components for remote reading of utility meters

Low loss optical fibers

Method of manufacture of optical fiber

Method of manufacturing graded index optical fibers

Sealing glass

Method of manufacturing graded index optical fibers

Preparation of photochromic gradient lenses

Photochromic gradient lenses

Preparation of photochromic gradient lenses of cosmetically improve...

Preparation of photochromic gradient lenses of improved color

Ophthalmic lens with locally variable index of refraction and metho...

High strength ophthalmic lens

Heat treatment method for making photochromic gradient lenses

Method of making artificial intraocular lenses with holes

Method of making artificial intraocular lenses with holes

High strength ophthalmic lens

Artificial intraocular lens

Ion exchangeable segment glass

High strength ophthalmic lens

Faraday rotation glasses