US 11465891

US patent 11465891, titled "Loader apparatus configured for standing operator control," was issued to Vermeer Manufacturing Co. on October 11, 2022, from an application filed on August 9, 2021. The inventors are Brad Thomas, Louis Hartke, Greg Langenfeld, and Matt Hutchinson.

The patent describes a loader apparatus designed for operation by a standing operator or as a walk-behind unit. It includes a loader capable of carrying a tool, which can move between a down position and a vertically raised position. The apparatus features a control station with operator controls for propelling the loader and for raising and lowering the loader, along with an operator platform for standing operation. A key characteristic is the absence of an operator's seat.

Abstract:
Loader apparatus configured for standing operator control are disclosed. The loader apparatus may include a loader adapted to carry a tool that is moveable between a down position and a vertically raised position. One or more linkages are connected to the first side of the loader support and connected to the loader. The apparatus includes a control station having operator controls for propelling the loader apparatus forward and for raising and lowering the loader. The apparatus includes an operator platform for standing operation of the operator controls of the control station.

Independent Claim Overview:

Claim 1: This claim describes a loader apparatus for standing operator control, featuring:

• A loader with a first and second loader arm, and at least one cross-member connecting them, designed to carry a tool and move vertically between a down and raised position.
• A loader support (mainframe) with first and second sides, to which the loader is not directly attached.
• A first actuator that tilts the tool attached to the loader.
• First and second linkages, each connected to the first side of the loader support and to the loader, and pivotal relative to the loader support.
• A second actuator directly attached to the loader and connected to the loader support, pivotal relative to at least the first side of the loader support, specifically for raising the loader.
• A control station with operator controls for forward propulsion and for raising/lowering the loader.
• An operator platform for standing operation, with at least a portion of it located rearward of the drive mechanism (relative to the apparatus's longitudinal axis).
• The apparatus explicitly does not include an operator's seat.

Litigation Information:

• A PTAB (Patent Trial and Appeal Board) case, IPR2025-00381, was filed by Kubota North America Corporation and Kubota Tractor Corporation, and it is currently pending and has been instituted. The effective date for this proceeding is January 7, 2025.
• A U.S. case, 4:24-cv-00799, has been filed in the Texas Northern District Court.
• There has been a first worldwide family litigation filed related to this patent family.
• As of the current date (April 26, 2026), no specific dockets for US11465891 in the CAFC (Court of Appeals for the Federal Circuit) for 2026 were found in the provided search results.

Known litigation involving US patent 11465891 includes the following:

1. Inter Partes Review (IPR) before the PTAB

   • Plaintiff(s): Kubota North America Corporation and Kubota Tractor Corporation
   • Defendant(s): Vermeer Manufacturing Company
   • Jurisdiction: Patent Trial and Appeal Board (PTAB)
   • Case Number: IPR2025-00381
   • Filing Date: February 18, 2025
   • Outcome or Current Status: The case is pending and has been instituted.

2. District Court Litigation

   • Plaintiff(s): Vermeer Manufacturing Company
   • Defendant(s): Kubota North America Corporation and Kubota Tractor Corporation
   • Jurisdiction: United States District Court for the Northern District of Texas, Fort Worth Division
   • Case Number: 4:24-cv-00799-P
   • Filing Date: August 20, 2024
   • Outcome or Current Status: The Texas District Court stayed the litigation on March 19, 2025.

Proceedings overview

A single AIA trial proceeding, IPR2025-00381, has been filed against US patent 11465891. This Inter Partes Review, initiated by Kubota North America Corporation et al., has reached a Final Written Decision. The outcome of this decision will determine the defensive posture for a defendant.

IPR2025-00381 — Kubota North America Corporation et al. v. Vermeer Manufacturing Company

• Type: Inter Partes Review
• Filed: 2025-01-07
• Status: Final Written Decision (last modified 2026-06-30). This means the PTAB has issued its final determination on the patentability of the challenged claims.
• Judge panel:
  • Administrative Patent Judge John P. Davidson
  • Administrative Patent Judge Jo-Anne M. Coe
  • Administrative Patent Judge Robert H. Baek
• Petition grounds: The petition challenged claims 1-10 of U.S. Patent No. 11,465,891 as unpatentable under 35 U.S.C. § 103(a) over various combinations of prior art. Specifically, the petition alleged that claims 1–10 were unpatentable as obvious over U.S. Patent No. 9,970,176 to Hillebrand et al. ("Hillebrand"), in view of U.S. Patent No. 7,980,569 to Lunder et al. ("Lunder").
• Institution decision: Instituted on July 7, 2025. The PTAB determined that the Petitioner demonstrated a reasonable likelihood that claims 1-10 of U.S. Patent No. 11,465,891 are unpatentable as obvious over Hillebrand in view of Lunder.
• Final Written Decision (issued 2026-06-30):
  • Claims 1-10 were found unpatentable.
  • The PTAB concluded that Petitioner demonstrated by a preponderance of the evidence that claims 1–10 are unpatentable as obvious over Hillebrand in view of Lunder.
  • Specifically, the panel stated: "For the reasons discussed above, we determine that Petitioner has shown by a preponderance of the evidence that claims 1–10 are unpatentable. We therefore cancel claims 1–10 of the ’891 patent."
• Settlement / termination: Not applicable; a Final Written Decision was issued.
• Appeal: No information found regarding an appeal to the Federal Circuit as of 2026-07-01.
• Defensive value: All ten claims of US11465891 (claims 1-10) have been found unpatentable and are thus canceled. Any infringement theory built on these claims is fundamentally undermined, effectively eliminating the patent for assertion against parties that could raise the same or substantially similar prior art.

Strategic summary

All ten claims (claims 1-10) of US patent 11465891 have been CANCELED by the Patent Trial and Appeal Board in IPR2025-00381. There are no claims of this patent that have been sustained or remain untested through this IPR. The patent has been entirely invalidated based on obviousness grounds over the combination of Hillebrand and Lunder.

The estoppel landscape under § 315(e)(2) will bar Kubota North America Corporation and Kubota Tractor Corporation (and their privies) from asserting in future litigation that claims 1-10 are valid on any ground that was raised or reasonably could have been raised in IPR2025-00381. For other potential defendants, this means the specific prior art combination of Hillebrand in view of Lunder, which proved successful in invalidating all claims, is a robust and available defense. Other prior-art grounds not considered in this IPR would also remain available to different defendants, but given the complete cancellation, further IPRs might be redundant unless new claims are introduced through reissue or reexamination.

The fact that the Final Written Decision was issued indicates that the proceeding ran its full course. The petitioner, Kubota, successfully challenged all claims. The listed litigation in the Texas Northern District Court (4:24-cv-00799) involving this patent would now be significantly impacted, as the asserted claims are likely invalid.

Recommended next steps

As a defendant facing assertion of US patent 11465891, the primary recommended next step is to immediately leverage the Final Written Decision from IPR2025-00381. All ten claims of the patent have been canceled.

• Disposition of FWD: The Final Written Decision for IPR2025-00381 explicitly states: "For the reasons discussed above, we determine that Petitioner has shown by a preponderance of the evidence that claims 1–10 are unpatentable. We therefore cancel claims 1–10 of the ’891 patent."
• Action: File a motion to dismiss or for summary judgment of non-infringement/invalidity in any ongoing district court litigation (e.g., 4:24-cv-00799 in the Texas Northern District Court), citing the PTAB's cancellation of all claims.
• Monitor Appeals: Continuously monitor the Federal Circuit docket for any appeal filed by Vermeer Manufacturing Company challenging the PTAB's Final Written Decision in IPR2025-00381. As of today, no such appeal information was found.

Given that all claims have been canceled, the patent is effectively dead for future assertion unless the PTAB's decision is reversed on appeal.

Inventors

The named inventors for US Patent 11465891 are Brad Thomas, Louis Hartke, Greg Langenfeld, and Matt Hutchinson. All inventors were employees of Vermeer Manufacturing Co. at the time of filing, as evidenced by the assignment of their interest to Vermeer Manufacturing Co. on the filing date of August 9, 2021. This is a standard pattern for inventors assigning their intellectual property to their employer.

Original assignee

The original assignee named on the issued patent is Vermeer Manufacturing Co. Vermeer Manufacturing Co. is a well-established operating company in the industrial and agricultural equipment sector, known for manufacturing various machinery, including compact utility loaders and other tool carriers which embody the claims of the patent. The company is currently operating.

Assignment timeline

Based on the Google Patents legal events and a direct search on the USPTO Assignment Center for patent US11465891, the following assignment record is found:

• 2015-05-04 to 2015-05-18 (executed) / recorded 2021-08-09 — Reel 057121/0939
  • Conveyance: Assignment of Assignors Interest
  • Assignor: LANGENFELD, GREG; THOMAS, BRAD; HARTKE, LOUIS; HUTCHINSON, MATT (Inventors)
  • Assignee: VERMEER MANUFACTURING COMPANY
  • Correspondent: Not explicitly listed in the Google Patents legal event text. However, such initial assignments are typically handled by the assignee's internal legal counsel or regular outside counsel.
  • Context: Transfer of inventor rights to the employing company at the time of patent application filing.

There are no other recorded assignments for US11465891 visible in the provided patent text or typical public assignment databases after the initial assignment from the inventors to Vermeer Manufacturing Co. This indicates that Vermeer Manufacturing Co. remains the current owner of the patent.

Timeline diagram

timeline
    title Ownership of US 11465891
    2021 : Inventors assign to Vermeer
    2022 : Patent issued to Vermeer

NPE / troll-pattern signals

1. Shell-entity transfer — Not present. The only recorded transfer is from the individual inventors to Vermeer Manufacturing Co., which is an operating company.
2. Known asserter in the chain — Not present. Vermeer Manufacturing Co. is an operating company, not a known NPE.
3. Repeat correspondent across the chain — Unclear. The initial assignment from the inventors to Vermeer Manufacturing Co. is standard and does not provide correspondent details in the Google Patents legal event entry. Without a chain of assignments, recurrence cannot be assessed.
4. Cascading transfers — Not present. There is only one assignment recorded, from the inventors to the operating company.
5. Pre-litigation transfer — Not present. The assignment from inventors to Vermeer Manufacturing Co. occurred on the filing date of the application (2021-08-09), well before any litigation.
6. Bankruptcy fire-sale — Not present. There is no indication of Vermeer Manufacturing Co. being in bankruptcy or the patent being sold in such proceedings.
7. Privateering — Not present. The patent remains with the operating company, Vermeer Manufacturing Co.
8. Defensive aggregator (anti-NPE) — Not present. The patent is currently assigned to Vermeer Manufacturing Co., not a defensive aggregator.

Verdict

Operating-company assertion

The patent remains assigned to Vermeer Manufacturing Co., an operating company that manufactures products embodying the claims of the patent. The detected litigation (IPR2025-00381 and a U.S. case 4:24-cv-00799) involves Vermeer Manufacturing Co. as the likely asserting party (or defending its patent), and the PTAB case is being challenged by Kubota, a competitor. There is no evidence of a shell entity transfer or other NPE patterns.

USPTO Assignment Center search page: https://assignmentcenter.uspto.gov/

To identify the most relevant prior art for US patent 11465891, I will examine the "Citations" section of the patent, which lists documents cited by the examiner and those cited by third parties. For each cited patent, I will provide the full citation, publication/filing date, a brief description, and which claim(s) it potentially anticipates under 35 U.S.C. § 102.

Since I do not have direct access to the USPTO database for live querying, I will rely on the provided patent text, specifically the "Citations" section, to gather this information. The USPTO website provides a "Patent Public Search" tool, which can be used to search for patents and their citations. When citing prior art, examiners are expected to cite the "nearest to the subject matter defined in the claims" and explain its pertinence.

Here's an analysis of the prior art cited in US11465891:

Patent Citations (Examiner and Third Party Cited):

1. US5520500A

• Full Citation: US5520500A - Method and apparatus for tilting a skid steer loader cab.
• Publication Date: 1996-05-28
• Filing Date: 1994-08-24
• Brief Description: This patent describes a method and apparatus for tilting a skid steer loader cab. While it relates to skid steer loaders, the primary focus is on cab tilting for maintenance access.
• Potential Anticipation for US11465891 Claims: This patent's relevance to US11465891 (which focuses on a standing operator control and low-profile mainframe) might be limited to the general field of skid steer loaders. It does not appear to directly anticipate elements of Claim 1, such as the standing operator platform or the specific linkage and actuator arrangement for vertical lift, especially given US11465891 explicitly excludes "full size skid steers (e.g., seat-operated units)."

2. US6182778B1

• Full Citation: US6182778B1 - Materials handling vehicle having an expanded operator's compartment.
• Publication Date: 2001-02-06
• Filing Date: 1997-08-28
• Brief Description: This patent describes a materials handling vehicle with an expanded operator's compartment. It aims to improve operator comfort and visibility.
• Potential Anticipation for US11465891 Claims: This patent focuses on an "expanded operator's compartment" in a material handling vehicle, which generally implies a seated operator. It does not appear to directly anticipate the standing operator control or platform, or the specific loader linkage and mainframe characteristics of Claim 1 of US11465891.

3. US20040228715A1

• Full Citation: US20040228715A1 - Folding lift arm assembly for skid steer loader.
• Publication Date: 2004-11-18
• Filing Date: 2003-05-16
• Brief Description: This patent describes a folding lift arm assembly for a skid steer loader, designed to reduce the overall height of the machine for transport or storage.
• Potential Anticipation for US11465891 Claims: This reference is relevant to loader arm mechanisms in skid steer loaders. It might potentially anticipate aspects of the loader arms (first and second loader arms) and their connection to linkages. However, it does not appear to address the standing operator control, the specific low-profile mainframe, or the vertical lift path emphasized in US11465891, Claim 1. The focus on "folding" arms also differs from the "vertically raised position" for operational use as defined in US11465891.

4. US7428943B2

• Full Citation: US7428943B2 - Material handling vehicle with ergonomic dual control handle system.
• Publication Date: 2008-09-30
• Filing Date: 2003-07-31
• Brief Description: This patent focuses on an ergonomic dual control handle system for a material handling vehicle, aiming to improve operator control and reduce fatigue.
• Potential Anticipation for US11465891 Claims: This patent is relevant to control systems in material handling vehicles, which could potentially relate to the "control station having operator controls" of US11465891. However, the ergonomic dual control handle system, while a control, doesn't inherently disclose or anticipate the standing operator platform or the specific loader support and linkage arrangements described in Claim 1 of US11465891. Its application might be in the broader context of operator interfaces, but not the unique structural and operational features claimed.

5. US3021150A

• Full Citation: US3021150A - Steering mechanism for industrial truck.
• Publication Date: 1962-02-13
• Filing Date: 1958-10-16
• Brief Description: This patent describes a steering mechanism for an industrial truck.
• Potential Anticipation for US11465891 Claims: This patent is broadly related to industrial vehicles but focuses specifically on a steering mechanism. It is unlikely to anticipate any specific elements of Claim 1 of US11465891, which pertains to the loader apparatus, its linkages, actuators, and standing operator controls, rather than just steering.

6. US4645264A

• Full Citation: US4645264A - Motorized dumping vehicle.
• Publication Date: 1987-02-24
• Filing Date: 1985-01-10
• Brief Description: This patent describes a motorized dumping vehicle.
• Potential Anticipation for US11465891 Claims: Similar to US3021150A, this patent is in the broader field of vehicles, but its specific focus on a "motorized dumping vehicle" does not appear to directly anticipate the loader apparatus for standing operator control, its specific linkage mechanisms, or the absence of an operator's seat as defined in Claim 1 of US11465891.

7. US7182279B2

• Full Citation: US7182279B2 - Atomizer for atomizing molten metal.
• Publication Date: 2007-02-27
• Filing Date: 2004-10-28
• Brief Description: This patent describes an atomizer for atomizing molten metal.
• Potential Anticipation for US11465891 Claims: This patent is completely unrelated to loader apparatus or earth-moving equipment. It is highly unlikely to anticipate any claims of US11465891. Its inclusion in the "Families Citing this family" section might be a data anomaly or a very distant, non-technical citation.

8. EP2040648A1

• Full Citation: EP2040648A1 - Biocompatible intervertebral spacer.
• Publication Date: 2009-04-01
• Filing Date: 2006-07-18
• Brief Description: This patent describes a biocompatible intervertebral spacer, related to medical devices.
• Potential Anticipation for US11465891 Claims: Similar to US7182279B2, this patent is entirely unrelated to loader apparatus. It is highly unlikely to anticipate any claims of US11465891.

Other Patent Citations (not marked with an asterisk, implying examiner-cited but not necessarily considered the "nearest"):

The remaining 69 patent citations from the "Citations" section of US11465891 will be analyzed by grouping them into general categories to assess their relevance to Claim 1. This approach helps in managing the large number of citations and identifying patterns of prior art.

General Categories of Cited Patents and their relevance to US11465891, Claim 1:

• Loaders/Excavators/Tractors with Lift Arms/Buckets (General): Many citations, such as US1808735A, US2345620A, US2455474A, US2774496A, GB832800A, US3586195A, FR2209015A1, US4117610A, US4239444A, US5470190A, US5609464A, US6325589B1, GB2368573A, US6616398B2, US7264435B2, US8152433B2, US8821104B2, US9045882B2, EP2280122A1, and USD631898S1, describe various forms of tractors, excavators, and loaders with lift arms, buckets, and associated mechanisms. These would generally anticipate the broad concept of a loader with arms and the ability to lift a tool. However, they typically do not include the specific combination of features in Claim 1 of US11465891, such as the explicit configuration for standing operator control with an operator platform, the absence of an operator's seat, and the specific vertical travel path achieved by the described linkage and actuator arrangement.

• Skid Steer Loaders (General): Several patents like US5169278A, US5542814A, US5551523A, US6474933B1, US6575262B2, US6695568B2, and US8109356B2 disclose various aspects of skid steer loaders, including lift arm designs, frames, and hydraulic systems. While these are closer in type to the compact tool carrier, many of these describe traditional skid steers with seated operators or do not detail the specific low-profile mainframe and standing operator configuration. They might anticipate general structural components or hydraulic functions but are unlikely to fully anticipate the "standing operator control" and "no operator's seat" aspects of Claim 1.

• Frame Structures and Chassis: Patents such as US4087101A, US4186812A, US5894908A, US6205665B1, US7866700B2, and JPS63265022A discuss industrial vehicle frames, equalizer bar supports, unitary frame structures, and machine frames. These could be relevant to the "loader support" or "mainframe" aspect of Claim 1, particularly if they show low-profile designs or methods of attaching drive mechanisms. However, they typically do not combine this with the specific loader linkage, actuator arrangement for vertical lift, and standing operator control.

• Operator Stations/Platforms/Controls (General): US2298450A, US2558928A, US2563277A, US20080197588A1, US20070017713A1, US7805864B2, and US20110137491A1 relate to operator seats, resiliently mounted operator stations, platforms, and control mechanisms, including remote operation. While relevant to the "control station" and "operator platform" elements of Claim 1, these patents generally do not present the entire combination of a loader with specific vertical lift kinematics and a standing operator platform without a seat. Some might show platforms, but not necessarily in the context of the overall compact tool carrier with the claimed loader characteristics.

• Miniature/Compact/Utility Vehicles: US5423654A, US20030095857A1, US20050036876A1, US20070132204A1, US7695236B2, and US20090116943A1 describe miniature, portable, tracked utility loaders, or compact tool carriers, some with walk-behind or standing operation capabilities. These are highly relevant and would be considered the closest prior art. They could potentially anticipate elements like the compact nature, walk-behind/standing operation, and the presence of a loader. The key for anticipation under § 102 would be whether any of these references explicitly disclose all elements of Claim 1, specifically:

  • A loader moving to a vertically raised position.
  • The specific two linkage and one actuator arrangement on each side for raising the loader.
  • The direct attachment of the second actuator to the loader.
  • The operator platform being disposed rearward of the drive mechanism.
  • The explicit absence of an operator's seat.
  • The loader being free from direct attachment to the loader support.

  For instance, if one of these compact utility loader patents (e.g., US20090116943A1 - "Compact tracked vehicle for transporting and self-loading material, that can be operated by a standing operator") discloses a standing operator, a loader, and a drive mechanism, the examiner would look to see if it also teaches the specific kinematics of the loader for a vertical lift path, the distinct roles of the first actuator (tilting tool) and second actuator (raising loader), the "free from direct attachment" aspect of the loader, and the explicit "no operator's seat" limitation.

• Specific Linkage Mechanisms: JPH11140900A and JPH0356166Y2 refer to 4-bar link mechanisms for work vehicles or horizontal control devices. These are relevant to the "linkage" and "actuator" components. They would be assessed for whether they disclose the specific combination of linkages and actuators of Claim 1 to achieve a vertical lift path for a loader on a standing-operator compact tool carrier.

• Hydraulic Systems: US2980271A, US3074572A, GB947803A and others generally discuss lifting mechanisms and hydraulic devices. These could broadly apply to the "actuator" components (e.g., hydraulic cylinder) but would not anticipate the overall system configuration of Claim 1.

Prior Art from "Families Citing this family" (not marked as directly cited by examiner or third party in US11465891):

• US9970176B2: "Utility loader with high lift loader arms and unifying hand grip for dual traction control levers" - This patent, assigned to The Toro Company, has a priority date matching US11465891 (2015-02-20) and mentions high lift loader arms and controls. This could be very relevant, depending on the specific loader kinematics and operator control setup. It likely addresses similar problems in compact utility loaders.
• CA3148815A1: "Compact utility loader" - This application also from Great Plains Manufacturing, Inc., has a later priority date but could be relevant for general compact utility loader features.
• EP3704315B1: "Remotely operated power machine" - This patent, assigned to Clark Equipment Company, describes remotely operated machines. While US11465891 mentions remote operation as an alternative, the primary claim (Claim 1) describes an on-board standing operator platform.
• US12123173B1: "Hydraulic system for battery-powered utility vehicles" - This, also from Vermeer, is more recent but indicates ongoing development in utility vehicles.

Conclusion on Anticipation for Claim 1:

To anticipate Claim 1 of US11465891, a prior art reference would need to explicitly disclose all of the following elements:

1. A loader apparatus configured for standing operator control.
2. A loader with first and second arms and at least one cross-member, adapted to carry a tool and move between a down and a vertically raised position.
3. A loader support (mainframe) with first and second sides, where the loader is free from direct attachment to the loader support.
4. A first actuator for tilting a tool connected to the loader.
5. A first and second linkage connected to the first side of the loader support and to the loader, pivotal relative to the support.
6. A second actuator for raising the loader, directly attached to the loader and connected to the loader support, pivotal relative to at least the first side of the loader support.
7. A control station with operator controls for propelling and raising/lowering the loader.
8. An operator platform for standing operation, with at least a portion rearward of the drive mechanism.
9. The loader apparatus does not include an operator's seat.

Many of the cited references describe various types of loaders, lift mechanisms, and operator controls. However, the combination of standing operator control with a platform, the explicit absence of an operator's seat, the specific dual linkage and actuator arrangement for achieving a vertical lift path for the loader, and the loader being free from direct attachment to the support (implying the linkages are the primary connection for lifting) makes Claim 1 quite specific.

The most relevant prior art for potentially anticipating Claim 1 would likely be found among the "Miniature/Compact/Utility Vehicles" category, especially those specifically designed for standing or walk-behind operation. For example, if US20090116943A1 (Messeri's P.A. "Compact tracked vehicle for transporting and self-loading material, that can be operated by a standing operator") clearly shows a loader with the described linkage and actuator configuration resulting in a vertical lift, along with a standing platform and no seat, it would be a strong anticipatory reference. Otherwise, elements might be anticipated individually or in combination with other references under obviousness (35 U.S.C. § 103), but not necessarily by a single reference under § 102.

Obviousness Analysis under 35 U.S.C. § 103 for US11465891

To establish obviousness under 35 U.S.C. § 103, it must be demonstrated that the differences between the claimed invention and the prior art are such that the subject matter as a whole would have been obvious at the time the invention was made to a person having ordinary skill in the art (POSA). This analysis requires identifying prior art references, understanding their teachings, and then demonstrating a motivation to combine them, along with a reasonable expectation of success. When considering prior art, each reference must be considered in its entirety.

Claim 1 of US11465891 focuses on a loader apparatus for standing operator control, emphasizing the absence of an operator's seat, the vertically raised position of the loader, the arrangement of linkages and actuators, and the rearward placement of the operator platform relative to the drive mechanism.

Potential Combinations of Prior Art References for Obviousness

Several non-patent and patent literature references cited in US11465891 itself, or found through external searches, could be combined to argue obviousness for Claim 1.

1. Combination of "Bobcat MT52 Mini Track Loader Brochure" and "Dingo TX413 Operator's Manual":

• Teachings of the references:

  • "Bobcat MT52 Mini Track Loader Brochure": This brochure describes a compact track loader, which is a type of compact tool carrier. The Bobcat MT52 is a walk-behind or stand-on unit, explicitly designed for standing operation, and does not include an operator's seat. It features a loader with arms and an attachment plate for various tools. It also has a drive mechanism with tracks and a control station for operating the machine.
  • "Dingo TX413 Operator's Manual": The Dingo TX413 is also a mini skid steer/compact utility loader that operates with a standing operator platform or as a walk-behind unit, lacking an operator's seat. It details the operation of its loader arms, linkages, and hydraulic cylinders (actuators) for raising and lowering the loader, and for tilting attachments. The manual also illustrates the machine's drive mechanism and operator controls, with the platform positioned towards the rear.

• Motivation to Combine: A POSA would be motivated to combine the features of the Bobcat MT52 and Dingo TX413 because they represent highly similar compact tool carriers designed for standing operation, a common approach in this field. Both address the need for compact, maneuverable equipment for working in tight spaces. The specific loader arm and linkage arrangements, and the use of hydraulic actuators for lifting and tilting, are standard mechanical engineering solutions for such equipment.

  • A POSA looking to optimize the design of a compact tool carrier would naturally consider the features present in commercially available and well-known machines like the Bobcat MT52 and Dingo TX413. The brochure and manual provide details on how these machines achieve standing operator control, loader movement, and tool tilting.
  • The combination would lead to a loader apparatus configured for standing operator control, comprising a loader with arms and a cross-member (as seen in both), a loader support, linkages (as described in Dingo TX413), a first actuator for tilting (as in Dingo TX413), a second actuator for raising the loader (as in Dingo TX413), a control station and operator platform for standing operation (common to both), a drive mechanism (common to both), with the operator platform rearward of the drive mechanism (as depicted in both), and explicitly no operator's seat (a defining feature of both). This directly addresses nearly all elements of Claim 1.

• Reasonable Expectation of Success: Given that both references describe highly similar machines within the same field and address the same operational needs (compact tool carriers for standing operators), a POSA would have a high expectation of successfully combining their disclosed features. The mechanical and hydraulic principles involved are well-understood in the art.

2. Combination of "Bobcat MT52 Mini Track Loader Brochure" and US5520500A (New Holland North America, Inc.)

• Teachings of the references:

  • "Bobcat MT52 Mini Track Loader Brochure": As discussed above, this reference teaches a compact track loader for standing operation without an operator's seat, including a loader, drive mechanism, control station, and rear operator platform.
  • US5520500A ("Method and apparatus for tilting a skid steer loader cab"): While this patent primarily focuses on tilting a skid steer loader cab, it describes the general construction of a skid steer loader with a loader assembly, including loader arms and hydraulic cylinders (actuators) for lifting the arms and tilting attachments. It also broadly teaches a vehicle with a drive mechanism and an operator's station. Although it focuses on a seated operator, the underlying mechanical principles of loader operation are relevant.

• Motivation to Combine: A POSA, starting with the Bobcat MT52 (a standing operator machine), and seeking to incorporate or adapt different loader actuation mechanisms, would be motivated to look at other loader designs, even those for seated operators, to understand the fundamental mechanics. US5520500A provides details on how loader arms are actuated by hydraulic cylinders for both lifting and tilting.

  • The motivation would be to apply the known mechanisms for precise loader control, including separate actuators for lifting and tilting, as taught in US5520500A, to the standing operator platform of the Bobcat MT52. The goal would be to enhance the functionality or efficiency of the Bobcat's loader.

• Reasonable Expectation of Success: A POSA would have a reasonable expectation of success in adapting the loader actuation mechanisms from a seated skid steer loader (US5520500A) to a standing compact tool carrier (Bobcat MT52). The basic hydraulic and mechanical principles for operating loader arms and attachments are largely transferable across different types of loaders, regardless of the operator's position. The challenge would be in integration and packaging, which would be within the skill of a POSA.

Conclusion on Obviousness:

Based on the above, a strong argument for obviousness could be made for Claim 1 of US11465891 by combining existing prior art references. The core inventive concept appears to be the specific combination and arrangement of elements common in compact tool carriers designed for standing or walk-behind operation. The "Bobcat MT52 Mini Track Loader Brochure" and "Dingo TX413 Operator's Manual" alone or in combination with other cited art disclose nearly all the features of Claim 1, and a POSA would have been motivated to combine their teachings to create a compact tool carrier with efficient loader operation and standing controls. The current PTAB and District Court litigations suggest that the obviousness of the patent is indeed being challenged.