Inventor
Walter J. Grandfield
Inventor
Lake Worth, FL, US
Overview
Patents· 11 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
H04Bprimary
H04BTransmission30%
H03GControl of amplification13%
H04WWireless communication networks13%
G08BSignalling systems, e.g. personal calling systems9%
H03DDemodulation or transference of modulation from one carrier to another9%
G05FSystems for regulating electric or magnetic variables4%
H03BGeneration of oscillations, directly or by frequency-changing, by circuits employing active elements which operate in a non-switching manner4%
H03CModulation4%
H03HImpedance networks, e.g. resonant circuits4%
H03KPulse technique4%
PatentTitleYear
8,068,795'RF multiband transmitter with balun'20116,006,079'Radio having a fast adapting direct conversion receiver'19995,740,524'Feed-forward RSSI assisted radio frequency amplifier power control'19985,564,092'Differential feed-forward amplifier power control for a radio receiver system'19965,535,444'Diode loaded feed-forward radio frequency amplifier power control'19965,448,772'Stacked double balanced mixer circuit'19954,928,314'Heterodyne stage having precise closed-loop control of the amplitude of the injection signal thereof'19904,928,086'Pager receiver having a common timer circuit for both sequential lock-out and out-of-range'19904,862,015'Constant propagation delay current reference'19894,814,763'Paging terminal apparatus with page forwarding capability and methodology thereof'19894,811,379'Speak back paging system'1989Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1989–1999Patents assigned to MOTOROLA INC (9)· patent assignee history
1989–1996Based in Lake Worth, FL, US· patent location history
1998Based in Chandler, AZ, US· patent location history
1999–2011Based in Phoenix, AZ, US· patent location history
2011Patents assigned to BAVISI AMIT D (1)· patent assignee history
2011Patents assigned to FREESCALE SEMICONDUCTOR INC (1)· patent assignee history
2011Patents assigned to GRANDFIELD WALTER J (1)· patent assignee history
2011Patents assigned to KEYVANI DARIOUSH (1)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| MOTOROLA INC | 9 | 1989–1999 |
| BAVISI AMIT D | 1 | 2011 |
| FREESCALE SEMICONDUCTOR INC | 1 | 2011 |
| GRANDFIELD WALTER Jself | 1 | 2011 |
| KEYVANI DARIOUSH | 1 | 2011 |
Locations
| Location | Patents | Span |
|---|---|---|
| Lake Worth, Florida, US | 8 | 1989–1996 |
| Phoenix, AZ, US | 2 | 1999–2011 |
| Chandler, AZ, US | 1 | 1998 |