Inventor
Howard F. Jirka
Inventor
Crystal Lake, IL, US
Overview
Patents· 7 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
H04Nprimary
H04NPictorial communication, e.g. television50%
H04MTelephonic communication38%
H02MApparatus for conversion between ac and ac, between ac and dc, or between dc and dc, and for use with mains or similar power supply systems13%
PatentTitleYear
4,780,696'Multifilar transformer apparatus and winding method'19884,679,132'Floating battery feed circuit using multifilar transformer'19874,402,039'Telephone line circuit'19834,340,906'Video signal coding by video signal polarity reversal on the basis of brightness level comparison'19824,080,628'Expanded-signal image enhancement system'19783,936,869'Automatic color level circuit with peak detector'19763,935,384'Network for generating a CRT control signal for enhancing the edges of television images'1976Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1976–1978Patents assigned to ZENITH RADIO CORP (3)· patent assignee history
1976–1978Based in Mount Prospect, IL, US· patent location history
1982Patents assigned to OAK INDUSTRIES INC (1)· patent assignee history
1982–1988Based in Crystal Lake, IL, US· patent location history
1983Patents assigned to BELL TELEPHONE LABOR INC (1)· patent assignee history
1987–1988Patents assigned to AMERICAN TELEPHONE & TELEGRAPH (2)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| ZENITH RADIO CORP | 3 | 1976–1978 |
| AMERICAN TELEPHONE & TELEGRAPH | 2 | 1987–1988 |
| BELL TELEPHONE LABOR INC | 1 | 1983 |
| OAK INDUSTRIES INC | 1 | 1982 |
Locations
| Location | Patents | Span |
|---|---|---|
| Crystal Lake, Illinois, US | 4 | 1982–1988 |
| Mount Prospect, Illinois, US | 3 | 1976–1978 |