Inventor · disambiguated record
John A. Letchford
Also filed as: LETCHFORD JOHN A
4 granted patents·64 citations·filing 1984–1990
77Inventor score
Top patents by PatentIndex Score
4 records- 0170US4598194AQuartz infra-red lampsEMI PLC THORN·Filed 1985·Granted Jul 1, 1986·28 cites·5 claims
- 0259US4556786AHeating apparatusTHORN EMI DOMESTIC APPLIANCES·Filed 1984·Granted Dec 3, 1985·20 cites·9 claims
- 0346US5157758ATungsten halogen lampEMI PLC THORN·Filed 1990·Granted Oct 20, 1992·13 cites·2 claims
- 0443USD291368SFilter holderEMI PLC THORN·Filed 1984·Granted Aug 11, 1987·3 cites·1 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →