Inventor · disambiguated record
Hartmut Schrenk
Also filed as: SCHRENK HARTMUT
23 granted patents·724 citations·filing 1978–1997
97Inventor score
Files withSIEMENS AG23
Top patents by PatentIndex Score
23 records- 0199US4279024AWord-by-word electrically reprogrammable nonvolatile memorySIEMENS AG·Filed 1979·Granted Jul 14, 1981·160 cites·13 claims
- 0290US4638457AMethod and apparatus for the non-volatile storage of the count of an electronic counting circuitSIEMENS AG·Filed 1982·Granted Jan 20, 1987·36 cites·14 claims
- 0389US4675544ACMOS-inverterSIEMENS AG·Filed 1986·Granted Jun 23, 1987·45 cites·8 claims
- 0486US5001332AMethod and circuit for manipulation-proof devaluation of EEPROMSSIEMENS AG·Filed 1988·Granted Mar 19, 1991·48 cites·7 claims
- 0580US4209849ANon-volatile memory which can be erased word by word constructed in the floating gate techniqueSIEMENS AG·Filed 1978·Granted Jun 24, 1980·23 cites·24 claims
- 0679US4572946ACredit card circuit arrangement with a memory and an access control unitSIEMENS AG·Filed 1984·Granted Feb 25, 1986·29 cites·11 claims
- 0774US4648076ACircuit having a data memory and addressing unit for reading, writing and erasing the memorySIEMENS AG·Filed 1984·Granted Mar 3, 1987·34 cites·9 claims
- 0871US4680736AMethod for operating a user memory designed a non-volatile write-read memory, and arrangement for implementing the methodSIEMENS AG·Filed 1984·Granted Jul 14, 1987·29 cites·13 claims
- 0967US4755970AMethod and apparatus for functional testing of a memory which is reprogrammable electrically word by wordSIEMENS AG·Filed 1985·Granted Jul 5, 1988·22 cites·13 claims
- 1066US4910707AEEPROM with protective circuitSIEMENS AG·Filed 1989·Granted Mar 20, 1990·30 cites·6 claims
- 1164US4767950AMOS inverter circuit having two different supply voltagesSIEMENS AG·Filed 1986·Granted Aug 30, 1988·14 cites·7 claims
- 1259US5014311AIntegrated circuit with an access-controlled data memorySIEMENS AG·Filed 1989·Granted May 7, 1991·80 cites·19 claims
- 1357US5889266AData transfer system having a terminal and a portable data carrier configuration and method for recharging the portable data carrier configuration using the terminalSIEMENS AG·Filed 1997·Granted Mar 30, 1999·49 cites·33 claims
- 1457US4819204AMethod for controlling memory access on a chip card and apparatus for carrying out the methodSIEMENS AG·Filed 1986·Granted Apr 4, 1989·24 cites·8 claims
- 1557US4712177ACircuit for a cord carrier having a memory and an access control unit for secure data accessSIEMENS AG·Filed 1984·Granted Dec 8, 1987·13 cites·17 claims
- 1654US4835742AWord-by-word electrically reprogrammable non-volatile memory and method of operation thereofSIEMENS AG·Filed 1987·Granted May 30, 1989·13 cites·18 claims
- 1753US4814849AMonolithically integrated semiconductor circuitSIEMENS AG·Filed 1987·Granted Mar 21, 1989·18 cites·6 claims
- 1843US6095411AElectronic debit card and method for recharging an electronic debit cardSIEMENS AG·Filed 1997·Granted Aug 1, 2000·17 cites·15 claims
- 1942US5511023AMethod and circuit configuration for debiting a debit cardSIEMENS AG·Filed 1994·Granted Apr 23, 1996·11 cites·9 claims
- 2042US5497462AMethod and circuit for protecting circuit configurations having an electrically programmable non-volatile memorySIEMENS AG·Filed 1994·Granted Mar 5, 1996·9 cites·4 claims
- 2141US5678027AMethod for preventing unauthorized modification of data in a device with a nonvolatile memorySIEMENS AG·Filed 1994·Granted Oct 14, 1997·13 cites·2 claims
- 2234US4941034AIntegrated semiconductor circuitSIEMENS AG·Filed 1988·Granted Jul 10, 1990·5 cites·7 claims
- 2331US4819202ARelease process for an access-controlled user memory and apparatus for carrying out the processSIEMENS AG·Filed 1986·Granted Apr 4, 1989·2 cites·2 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →