Inventor
Henry J. Zylstra
Inventor
Alburnette, IA, US
Overview
Patents· 26 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
H02Hprimary
H02HEmergency protective circuit arrangements48%
H01HElectric switches26%
G01RMeasuring electric variables7%
H01FMagnets7%
G05FSystems for regulating electric or magnetic variables5%
F16DCouplings for transmitting rotation2%
H02BBoards, substations or switching arrangements for the supply or distribution of electric power2%
H02PControl or regulation of electric motors, electric generators or dynamo-electric converters2%
PatentTitleYear
8,400,744'Earth leakage detection module with robust transient suppression'20138,395,065'Portable remote racking device for a circuit breaker'20138,238,066'Current sensor for earth leakage module'20126,654,217'Quick responding instantaneous trip system'20035,519,368'Compact coil assembly for transient voltage protection'1996RE035190'Plug-in power supply'19965,019,936'Voltage-to-frequency squared circuit'19915,016,135'Power supply incorporating circuit breaker and fault detection circuit'19914,992,723'Fault-powered power supply'19914,931,893'Loss of neutral or ground protection circuit'19904,912,380'Field installable electrical operator for a circuit breaker'19904,910,443'Electronic control circuit for a bidirectional motor'19904,901,219'Plug-in power supply'19904,897,756'Add-on ground fault module'19904,746,891'High saturation three coil current transformer'19884,652,965'High level magnetic trip circuit'19874,631,624'Time delay undervoltage release'19864,538,194'Ground fault desensitization circuit for electronic breaker'19854,486,803'Electronic system for high amperage circuit interruption apparatus'19844,466,042'Trip indicator assembly for electronic circuit breaker'19844,213,165'Circuit breaker having an electronic fault sensing and trip initiating unit'19804,209,818'Circuit breaker having an electronic fault sensing and trip initiating unit'19804,208,693'Circuit breaker having an electronic fault sensing and trip initiating unit'19804,208,690'Circuit breaker having an electronic fault sensing and trip initiating unit'19804,208,689'Circuit breaker having an electronic fault sensing and trip initiating unit'19804,197,567'Portable ground fault circuit interrupter'1980Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1980Patents assigned to SQUARE D (6)· patent assignee history
1980–1990Based in Alburnette, IA, US· patent location history
1984–2003Patents assigned to SQUARE D CO (17)· patent assignee history
1990–2013Based in Alburnett, IA, US· patent location history
1990Based in Lincoln, NE, US· patent location history
2012–2013Patents assigned to SCHNEIDER ELECTRIC USA INC (3)· patent assignee history
2012–2013Patents assigned to ZYLSTRA HENRY J (3)· patent assignee history
2013Patents assigned to DVORAK ROBERT F (1)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| SQUARE D CO | 17 | 1984–2003 |
| SQUARE D | 6 | 1980 |
| SCHNEIDER ELECTRIC USA INC | 3 | 2012–2013 |
| ZYLSTRA HENRY Jself | 3 | 2012–2013 |
| DVORAK ROBERT F | 1 | 2013 |
Locations
| Location | Patents | Span |
|---|---|---|
| Alburnette, IA, US | 13 | 1980–1990 |
| Alburnett, IA, US | 12 | 1990–2013 |
| Lincoln, NE, US | 1 | 1990 |