Pipe plug lock unit

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Information

Patent Grant
D329687

References
Source

Patent Number
D329,687
Date Filed
Thursday, June 14, 1990
35 years ago
Date Issued
Tuesday, September 22, 1992
33 years ago

Inventors
- Allen D. Mathison
- Bryan R. Benson
Original Assignees
- Cherne Industries Incorporated
Examiners
- Largen; James R.
Agents
- Eggink; Anthony G.

US Classifications
- D23 - Environmental heating and cooling
Field of Search
- US
- D23 259-263
- D08 336
- D08 338
- 138 89
- 220 237
- 220 311
- 215 359
- Term of Grant
  14Years

Information

Abstract

Description

Claims

The ornamental design for the pipe plug lock unit, as shown and described.

US Referenced Citations (11)

Number	Name	Date	Kind
D208016	Bullard	Jun 1967
D242521	Plympton	Nov 1976
D257218	Eriksson	Oct 1980
D283246	Jack	Apr 1986
D300350	Mathison	Mar 1989
D305927	Linderman et al.	Feb 1990
3672403	Wilson et al.	Jun 1972
4370919	Wagner	Feb 1983
4415005	Janzen	Nov 1983
4614206	Mathison et al.	Sep 1986
4762151	Kinnan	Aug 1988