Toro Co. v. White Consolidated Industries, Inc.

920 F. Supp. 1008, 1996 U.S. Dist. LEXIS 3987
CourtDistrict Court, D. Minnesota
DecidedMarch 26, 1996
DocketCivil 4-95-656
StatusPublished
Cited by4 cases

This text of 920 F. Supp. 1008 (Toro Co. v. White Consolidated Industries, Inc.) is published on Counsel Stack Legal Research, covering District Court, D. Minnesota primary law. Counsel Stack provides free access to over 12 million legal documents including statutes, case law, regulations, and constitutions.

Bluebook
Toro Co. v. White Consolidated Industries, Inc., 920 F. Supp. 1008, 1996 U.S. Dist. LEXIS 3987 (mnd 1996).

Opinion

ORDER

DOTY, District Judge.

This matter is before the court on the motion of plaintiff The Toro Company (“Toro”) for a preliminary injunction. Based upon a review of the file, record and proceedings herein, and for the reasons stated below, the court denies plaintiff’s motion.

BACKGROUND

This case concerns the alleged infringement of United States Patent No. 4,694,528 (the “ ’528 patent”), which describes a hand-held convertible electric vacuum-blower apparatus (“vacuum-blower”) of the type commonly used in yard work to collect leaves and other debris. The patent application was filed on July 18, 1986, and was issued on September 22, 1987. The ’528 patent was assigned to Toro.

Toro is a Delaware corporation with its principal place of business in Bloomington, Minnesota. Defendants 'White Consolidated Industries, Inc. and WCI Outdoor Products, Inc. (“White”) are also Delaware corporations with their principal place of business in Cleveland, Ohio. Both Toro and White are established manufacturers and distributors of various power lawn-care implements, including electric vacuum-blowers. White manufactures and distributes vacuum-blowers through its Poulan/Weed Eater subsidiary. White also distributes its vacuum-blowers under the trademark Paramount (principally in the western United States) and manufactures vacuum-blowers under an exclusive arrangement with Sears, Roebuck & Co.

A vacuum-blower is a lawn-care implement which can be used to selectively blow or vacuum leaves and other debris. The basic components of a vacuum-blower are a hous *1011 ing having an air inlet and an air outlet, a paddle-wheel shaped fan (called an “impeller”) located inside the housing, and an electric motor attached to the impeller. The electric motor rotates the impeller at high speeds, thereby sucking air through the air inlet and expelling it through the air outlet. To use the device as a blower, a tube is placed over the outlet. Air is then drawn in the air inlet and expelled through the tube creating a high velocity column of air. The operator simply points the nozzle of the vacuum-blower to direct the air column at the debris.

The rotation of the impeller also creates a powerful vacuum. When used as a vacuum, a vacuum tube is placed over the air inlet. The operator attaches a refuse bag to the housing and over the air outlet nozzle. Debris is sucked up the vacuum tube, through the fan housing, out the nozzle and into the debris bag.

Air must flow into the air inlet for the vacuum-blower to function. There must also be a cover over the air inlet to protect the operator’s fingers from the rotating impeller. Thus, a vacuum-blower must have a cover which allows air to pass into the inlet and at the same time prevents the operator’s fingers from coming in contact with the rotating impeller. The operator’s fingers are protected from the air inlet by the vacuum tube when the device is operating as a vacuum. The cover is only necessary when operating the device as a blower. The structural design of the air inlet cover is at issue in this case.

A. The Toro Vacuum/Blower

The air inlet cover for the Toro product is completely detachable. When the vacuum-blower is operating as a vacuum, the cover is detached from the housing by twisting it to release it from the housing’s interlocking tabs and pulling it away. After removing the cover, a vacuum tube is then inserted into the air inlet and secured. When operating as a blower, the air inlet cover is attached to the housing by twisting it into place over the air inlet and securing the interlocking tabs. In this mode, air flows into the air inlet through the apertures in the cover and “beneath the lower edge of the rim” of the cover and the housing. ’528 patent, col. 6, lines 36-40. The “rim” is spaced away from the side of the housing so that air may pass through the gap between it and the housing into the air intake. A “pressure ring” is attached to the inside of the cover in order to increase the velocity of the air column when operating in the blower mode. When the cover assembly is placed over the air inlet, the ring becomes positioned over the air inlet. This ring helps maintain the pressure differential between air inlet and air outlet sides of the impeller.

The ’528 patent has 17 claims. Toro asserts that White’s latest modifications to its vaeuum/blowers infringes on claim 16 of the ’528 patent and claim 17 which depends on claim 16. 1 Claim 16 provides as follows:

16. A convertible vacuum-blower comprising:
[i] a housing having an air inlet and an air outlet;
[ii] a motor supported in said housing;
[in] an impeller having a plurality of impeller blades supported for rotary motion in said housing, in fluid communication with said air inlet and said air outlet, an rotably driven by said motor;
[iv] a removable air inlet cover for covering said air inlet, said air inlet cover having apertures for the passage of air through the cover;
[v] attachment means for removably securing said air inlet cover to said housing; and
[vi] said cover including means for increasing the pressure developed by said vacuum-blower during operation as a blower when air is being supplied to said impeller through said apertured cover.

’528 patent, col. 9, lines 15-19; col 10, lines 1-11. 2 Claim 17 of the ’528 patent reads as follows:

*1012 17. A convertible vacuum-blower in accordance with claim 16 wherein said pressure differential increasing means includes a ring carried by said cover and disposed sufficiently close to said impeller to prevent air spill over between the high pressure side and the low pressure side of said impeller blades during rotation of said impeller.

’528 patent, col. 10, lines 12-18.

B. The Accused Device

White’s latest vacuum-blowers have a two-piece cover. Both components cover the air inlet when the device is operated as a blower. One component of the cover is the air inlet restrictor or “baffle.” The air inlet restrictor is a separate, removable piece of molded plastic in the shape of a cylinder with a flange at the bottom. This removable “baffle” is the latest modification to the air inlet cover on White’s products and replaces an older design in which a metal restrictor was permanently attached to the blower housing. The previous metal restrictor could not be removed for vacuuming. The second component of the cover is the air inlet lid which is attached to the blower housing by a hinge.

When operating as a vacuum, the White product covers the air inlet in roughly the same method as the Toro. The baffle is removed by twisting and removing it and then a vacuum tube is inserted into the air inlet allowing air intake and at the same time protecting the operator’s fingers from the impeller. Unlike the Toro, the air inlet lid on the White product is not fully detached when vacuuming. Instead it is affixed to the housing by a hinge.

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920 F. Supp. 1008, 1996 U.S. Dist. LEXIS 3987, Counsel Stack Legal Research, https://law.counselstack.com/opinion/toro-co-v-white-consolidated-industries-inc-mnd-1996.