Inventor · disambiguated record
John B. Littlefield
Also filed as: LITTLEFIELD JOHN B · LITTLEFIELD JOHN P
4 granted patents·1 pending application·95 citations·filing 1975–2001
78Inventor score
Top patents by PatentIndex Score
5 records- 0189US4219452AComposite friction elementAMSTED IND INC·Filed 1978·Granted Aug 26, 1980·62 cites·16 claims
- 0256US4169680AMethod and apparatus for making composition friction materialsAMSTED IND INC·Filed 1977·Granted Oct 2, 1979·14 cites·6 claims
- 0350US4313869AComposition friction element for a railroad brake shoeAMSTED IND INC·Filed 1980·Granted Feb 2, 1982·10 cites·3 claims
- 0443US4072650AFriction materialsLITTLEFIELD JOHN B·Filed 1975·Granted Feb 7, 1978·9 cites·8 claims
- 0534US2002022444A1Sanding screen element holderLITTLEFIELD JOHN P·Filed 2001·Application pending·0 cites
Join the waitlist — get patent alerts
Get an alert when John B. Littlefield files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →