Two position pressure demand inlet port adaptor

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Description

FIG. 1 is a perspective view of a two position pressure demand inlet port adaptor, showing the new design.

FIG. 2 is a front elevational view thereof.

FIG. 3 is a rear elevational view thereof.

FIG. 4 is a right-side elevational view thereof.

FIG. 5 is a left-side elevational view thereof.

FIG. 6 is a top plan view thereof.

FIG. 7 is a bottom plan view thereof.

FIG. 8 is a perspective view of a second embodiment of a two position pressure demand inlet port adaptor, showing the new design.

FIG. 9 is a front elevational view of the second embodiment shown in FIG. 8. The rear right side, left side, bottom and top elevational views are the same as those corresponding views illustrated in reference to the first embodiment.

FIG. 10 is a perspective view of a third embodiment of a two position pressure demand inlet port adaptor, showing the new design.

FIG. 11 is a front elevational view of the third embodiment shown in FIG. 10. The rear right side, bottom and top elevational views are the same as those corresponding views illustrated in reference to the first embodiment.

FIG. 12 is a perspective view of a fourth embodiment of a two position pressure demand inlet port adaptor, showing the new design; and,

FIG. 13 is a front elevational view of the fourth embodiment shown in FIG. 12. The rear right side, left side, bottom and top elevational views are the same as those corresponding views illustrated in reference to the first embodiment.

The broken lines shown in the drawings form no part of the claimed design. The shading shown in the drawings is provided merely to indicate the contour of the design; it is not intended to be indicative of any particular texture.

Referenced Cited
U.S. Patent Documents
4373520 February 15, 1983 Arbique
5224473 July 6, 1993 Bloomfield
Other references
  • Pro-Tech Cosmo.TM. product literature (May 1997). Willson Safety Products 6000 Series Supplied Air Line product literature. North Chemical Protection product literature. Kasco Venus product literature. Survivair Air Purifying Respirators product literature. LifeAir.TM. 1500 product literature. Cabot Safety AOSafety.TM. Respiratory Products product literature. 3M.TM. Continuous Flow Systems Marix product literature (Jun. 1998). ISI Asbestos Respiratory Protection product literature. Omnistar.TM. Respirator System product literature.
Patent History
Patent number: D421301
Type: Grant
Filed: Jul 20, 1998
Date of Patent: Feb 29, 2000
Assignee: 3M Innovative Properties Company (St. Paul, MN)
Inventors: Joseph G. Reischel (Woodbury, MN), Michael J. Bartholomew (Lake Elmo, MN), David P. Knivsland (North St. Paul, MN)
Primary Examiner: Stella Reid
Assistant Examiner: I Simmons
Attorney: Karl G. Hanson
Application Number: 0/90,933
Classifications
Current U.S. Class: D24/1106; Respirator, Vaporizer, Or Inhalation Tube (4) (D24/110)
International Classification: 2902;