Inventor
John A. Hammond
Inventor
Portland, OR, US
Overview
Patents· 11 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
F15Bprimary
F15BSystems acting by means of fluids in general18%
Y10TTechnical subjects covered by former us classification18%
F27DDetails or accessories of furnaces, kilns, ovens or retorts, in so far as they are of kinds occurring in more than one kind of furnace12%
C03BManufacture, shaping, or supplementary processes6%
F16KValves6%
G01FMeasuring volume, volume flow, mass flow or liquid level6%
G01HMeasurement of mechanical vibrations or ultrasonic, sonic or infrasonic waves6%
G01VGeophysics6%
G06FElectric digital data processing6%
H04LTransmission of digital information, e.g. telegraphic communication6%
PatentTitleYear
5,214,760'Adaptable multiple port data buffer'19935,208,846'Subscriber loop tester for telephone switching systems'19935,163,831'Refractory tile for a suspended furnace wall'19925,073,183'Hydraulically operated blanket batch charger'19915,011,402'Suspended furnace wall'19914,796,026'Noise tool and method'19894,766,601'Constant carrier watchdog'19884,615,358'Pilot valves for two-stage hydraulic devices'19864,598,626'Feedback controlled hydraulic valve system'19864,031,813'Hydraulic actuator controls'19773,953,819'Flow sensors'1976Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1976–1977Patents assigned to SPERRY RAND LTD (2)· patent assignee history
1976–1977Based in Guildford, GB· patent location history
1986Patents assigned to VICKERS INC (2)· patent assignee history
1986Based in Frinton on Sea, GB· patent location history
1988–1993Patents assigned to TEKTRONIX INC (3)· patent assignee history
1988–1993Based in Portland, OR, US· patent location history
1989Patents assigned to WESTERN ATLAS INT INC (1)· patent assignee history
1989Based in Houston, TX, US· patent location history
1991–1992Patents assigned to FRAZIER SIMPLEX (3)· patent assignee history
1991–1992Based in Washington, PA, US· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| FRAZIER SIMPLEX | 3 | 1991–1992 |
| TEKTRONIX INC | 3 | 1988–1993 |
| SPERRY RAND LTD | 2 | 1976–1977 |
| VICKERS INC | 2 | 1986 |
| WESTERN ATLAS INT INC | 1 | 1989 |
Locations
| Location | Patents | Span |
|---|---|---|
| Portland, OR, US | 3 | 1988–1993 |
| Washington, Pennsylvania, US | 3 | 1991–1992 |
| Guildford, GB | 2 | 1976–1977 |
| Houston, Texas, US | 1 | 1989 |
| Frinton on Sea, GB | 1 | 1986 |