Inventor

Peter K. Bertsch

Inventor

Harvard, MA, US

Overview

6→

Patents

1985–1989

Patent span

Mechanical engineering

Primary field (CPC F)

Patents· 6 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

F25Bprimary

F25BRefrigeration machines, plants or systems28%

F04BPositive-displacement machines for liquids17%

F05CIndexing scheme relating to materials, material properties or material characteristics for machines, engines or pumps other than non-positive-displacement machines or engines17%

F02GHot gas or combustion-product positive-displacement engine plants11%

F16JPistons11%

F16FSprings6%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests6%

Y10TTechnical subjects covered by former us classification6%

PatentTitleYear

4,873,913'Dry roughing pump having a gas film bearing'1989 4,754,608'Squeeze film bearing for Stirling cycle compressor pistons'1988 4,606,194'Cryocooler having low magnetic signature'1986 4,574,591'Clearance seals and piston for cryogenic refrigerator compressors'1986 4,550,571'Balanced integral Stirling cryogenic refrigerator'1985 4,543,792'Refrigeration system with clearance seals'1985

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1985–1989Patents assigned to HELIX TECH CORP (5)· patent assignee history

1985–1989Based in Harvard, MA, US· patent location history

1985–1986Based in Pepperell, MA, US· patent location history

1988Patents assigned to BERTSCH PETER K (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
HELIX TECH CORP	5	1985–1989
BERTSCH PETER Kself	1	1988

Locations

Location	Patents	Span
Harvard, Massachusetts, US	4	1985–1989
Pepperell, Massachusetts, US	2	1985–1986