Inventor

STEWART ANDREW D G

GB9 patents

⚠️ This page may combine multiple inventors who share the name “STEWART ANDREW D G”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

GERSAN ETS

2 patents

US5206699AApr 27, 1993

Sensing a narrow frequency band of radiation and gemstones

GERSAN ETS116 citations95

US5351117ASep 27, 1994

Sensing a narrow frequency band and gemstones

GERSAN ETS60 citations94

DOERMAN ERYK S

2 patents

US4916391AApr 10, 1990

LVDT displacement sensor with signal noise reduction for use in weighing apparatus

DOERMAN ERYK S31 citations89

US4696358ASep 29, 1987

Weighing a number of objects in succession

DOERMAN ERYK S33 citations89

SPANDREL ETS

1 patent

US4645922AFeb 24, 1987

Integrating sphere arrangement for producing size-corrected color signals

SPANDREL ETS25 citations90

WELFORD WALTER T

1 patent

US4529305AJul 16, 1985

Examining a gemstone

WELFORD WALTER T38 citations88

LAWRENCE JOHN C

1 patent

US4417564ANov 29, 1983

Centering and working gemstones

LAWRENCE JOHN C30 citations87

WELBOURN CHRISTOPHER M

1 patent

US4461568AJul 24, 1984

Assessing the color of gemstones and the like

WELBOURN CHRISTOPHER M25 citations76

GERSAN ANSTALT

1 patent

US5248877ASep 28, 1993

Making an elongate cut using high energy radiation

GERSAN ANSTALT9 citations72