Patent
   D298473
Priority
Aug 22 1986
Filed
Aug 22 1986
Issued
Nov 08 1988
Expiry
Nov 08 2002
Assg.orig
Entity
unknown
10
6
n/a
The ornamental design for a filtration unit for exhaust air from a clean room helmet worn in a sterile environment or the like, as shown and described.

FIG. 1 is a top plan view of a filtration unit for exhaust air from a clean room helmet worn in a sterile environment or the like showing our new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a left side elevational view thereof, the right side being substantially similar in appearance;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof; and

FIG. 6 is a perspective view thereof.

Stackhouse, Wyman H., Williamson, Ian M.

Patent Priority Assignee Title
6370695, Jan 16 1998 Depuy Orthopaedics, Inc. Head gear apparatus
6393617, Jan 16 1998 Depuy Orthopaedics, Inc. Head gear apparatus
6513168, Jan 16 1998 Depuy Orthopaedics, Inc. Head gear apparatus
6711748, Jan 16 1998 DEPUY SYNTHES PRODUCTS, INC Head gear apparatus having movably mounted fan
6990691, Jul 18 2003 DePuy Products, Inc.; DEPUY PRODUCTS, INC Head gear apparatus
7200873, Jul 18 2003 DePuy Products, Inc. Head gear apparatus having improved air flow arrangement
7937779, Jul 18 2003 DePuy Products Head gear apparatus having improved air flow arrangement
D912886, Oct 17 2019 Lighter
ER1167,
ER3934,
Patent Priority Assignee Title
3506667,
4548626, Apr 30 1984 SCOTT TECHNOLOGIES, INC Particulate air filter assembly
4614186, Nov 19 1984 Molecular Technology Corporation Air survival unit
4676236, Sep 09 1983 Gentex Corporation Helmet airflow system
238576,
D295046, Feb 25 1985 Minnesota Mining and Manufacturing Company Pump assembly for supplying air to a respirator, or the like
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Executed onAssignorAssigneeConveyanceFrameReelDoc
Aug 11 1986STACKHOUSE, WYMAN H W STACKHOUSE ASSOCIATES, INC ASSIGNMENT OF ASSIGNORS INTEREST 0045940783 pdf
Aug 11 1986WILLIAMSON, IAN M W STACKHOUSE ASSOCIATES, INC ASSIGNMENT OF ASSIGNORS INTEREST 0045940783 pdf
Aug 22 1986W. Stockhouse Associates Inc.(assignment on the face of the patent)
Dec 29 1988STACKHOUSE, WYMANSTACK HOLDINGS, INC ASSIGNMENT OF ASSIGNORS INTEREST 0051560632 pdf
Dec 29 1988STACKHOUSE, MILDREDSTACK HOLDINGS, INC ASSIGNMENT OF ASSIGNORS INTEREST 0051560632 pdf
Jul 24 1995STACKHOUSE, WYMAN H STACKHOUSE, INC ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS 0076290464 pdf
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