Inventor
Frederick D. Blum
Inventor
Silver Spring, MD, US
Overview
Patents· 4 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
H04Mprimary
H04MTelephonic communication43%
H04QSelecting43%
H04BTransmission14%
PatentTitleYear
5,790,634'Combination system for proactively and reactively maintaining telephone network facilities in a public switched telephone system'19985,790,633'System for proactively maintaining telephone network facilities in a public switched telephone network'19985,687,212'System for reactively maintaining telephone network facilities in a public switched telephone network'19974,087,656'Testing of inductively loaded transmission lines for correct loading'1978Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1978Patents assigned to BELL TELEPHONE LABOR INC (1)· patent assignee history
1978Based in Elon, NC, US· patent location history
1997–1998Patents assigned to BELL ATLANTIC NETWORK SERVICES (3)· patent assignee history
1997–1998Based in Silver Spring, MD, US· patent location history
1998Based in Springfield, VA, US· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| BELL ATLANTIC NETWORK SERVICES | 3 | 1997–1998 |
| BELL TELEPHONE LABOR INC | 1 | 1978 |
Locations
| Location | Patents | Span |
|---|---|---|
| Silver Spring, Maryland, US | 2 | 1997–1998 |
| Springfield, Virginia, US | 1 | 1998 |
| Elon, NC, US | 1 | 1978 |