Obviousness

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

A patent claim is considered obvious under 35 U.S.C. § 103 if "the differences between the claimed invention and the prior art are such that the claimed invention as a whole would have been obvious before the effective filing date of the claimed invention to a person having ordinary skill in the art to which the claimed invention pertains." This analysis involves several factual inquiries, known as the Graham Inquiries: (1) determining the scope and content of the prior art; (2) ascertaining the differences between the claimed invention and the prior art; and (3) resolving the level of ordinary skill in the pertinent art. A crucial aspect of an obviousness rejection is demonstrating a "motivation to combine" prior art references, which can come from the knowledge of those skilled in the art, the prior art reference itself, or the nature of the problem to be solved. The motivation to combine must provide a clear reason or rationale for a person of ordinary skill in the art to combine the elements in the claimed manner, and a reasonable expectation of success.

The claimed invention in US 9403550 relates to a stroller system with a first seat and a releasably connected second seat attachment that supports a second seat substantially below the first seat and closer to the front wheels. The second seat attachment includes left and right seat support elements with connector portions releasably connected to the stroller frame and left and right seat connectors for the second seat, allowing it to face forward or backward. [cite: The full patent text, Claims 1 and 7]

Potential Combinations of Prior Art References for Obviousness:

Combination 1: US 8955869 B2 (Zehfuss) in view of US 6209892 B1 (Schaaf) and general knowledge in the art.

• US 8955869 B2 (Zehfuss): This patent, which shares the same inventor and priority date as US 9403550, describes a seat attachment for a stroller capable of converting a single stroller into a double stroller. It discloses a seat attachment with connector portions that connect to a stroller frame and seat attachment elements capable of supporting a seat. Zehfuss also teaches that a seat support element can support a seat in either a forward or backward position. Furthermore, it details that the front seat can be positioned substantially over the front wheels to maintain stability, and the seat support element can be connected to the front wheel support frame. The patent also mentions that the stroller would typically comprise two seat connector portions, one for each side of the seat.
• US 6209892 B1 (Schaaf): This patent discloses a baby stroller apparatus for use in combination with a standard child's car seat. It shows that various types of child seats, including car seats, can be integrated with a stroller frame. Schaaf also details a latching mechanism for releasably engaging a locking component.
• Motivation to Combine: A person of ordinary skill in the art (POSITA) would be motivated to combine the teachings of Zehfuss with Schaaf to enhance the versatility and functionality of the convertible stroller. Zehfuss already teaches the core concept of a removable second seat and its placement. The specific types of seats (e.g., car seats) and releasable connection mechanisms (e.g., buttons, snaps, friction fittings, locking tabs, keyed connections) are well-known in the art of child mobility devices. Schaaf provides a clear example of integrating a car seat with a stroller using a releasable connection. A POSITA would recognize the benefit of providing a robust and interchangeable attachment system for various child seats, as explicitly stated in Zehfuss (stroller seat, baby seat, bassinet, pram, baby carrier, or car seat). [cite: The full patent text, Description section, "The seat attachment may support a seat such as, but not limited to, a stroller seat, a baby seat, a bassinet, a pram, a baby carrier, or a car seat, for example."] The desire to enhance commercial opportunities by improving a product to accommodate different child carriers is a common-sensical motivation in the stroller industry.

Combination 2: US 8955869 B2 (Zehfuss) in view of WO 2010/036365 A1 (Schwartz) and general knowledge in the art.

• US 8955869 B2 (Zehfuss): As noted above, Zehfuss discloses a convertible single-to-double stroller with a removable second seat, its placement, and the ability to orient it forward or backward. It also describes left and right attachment portions and seat support elements.
• WO 2010/036365 A1 (Schwartz): This reference describes a detachable tray accessory for a stroller, which includes a substantially crescent-shaped support bar with left and right side members that are removably attachable to a stroller seat or stroller assembly. The detachable means are located at the end of the left and right side members and can be, for example, spring-loaded detachable lock buttons.
• Motivation to Combine: A POSITA would be motivated to combine the features of Zehfuss and Schwartz to provide a more modular and user-friendly attachment system for the second seat. Schwartz explicitly teaches the use of left and right detachable means on a support bar to attach to a stroller, and mentions that these means could be located at the ends of the side members. Applying similar detachable connection concepts (e.g., buttons, snaps, friction fittings, interference fits, threaded connections, locking tabs, keyed connections, other fasteners) to the seat support elements of Zehfuss, as generically taught by Zehfuss, to create a secure and releasable connection for the second seat would be an obvious design choice for improving the ease of attachment and removal. [cite: The full patent text, Description section, "Releasable connections include, but are not limited to, buttons, snaps, friction fittings, interference fits, threaded connections, locking tabs, keyed connections, other fasteners, or the like."] The goal of making an attachment more convenient for the user is a well-understood design objective in the field.

Combination 3: US 8955869 B2 (Zehfuss) in view of US 8714582 B2 (Goldschmidt et al.) and general knowledge in the art.

• US 8955869 B2 (Zehfuss): Zehfuss describes the attachment of a second seat, the position of the front seat over the front wheels for stability, and the connection of the seat support element to the front wheel support frame.
• US 8714582 B2 (Goldschmidt et al.): This patent describes a ride-along board for a baby stroller, which can be attached to the stroller frame or to the axle of one of the rear wheels. It also mentions various attachment mechanisms such as pins, snaps, and quick releases. Goldschmidt et al. also discusses positioning the wheels of the ride-along board such that the center of mass is within the wheel base to reduce forces on the stroller.
• Motivation to Combine: While Goldschmidt et al. focuses on a ride-along board, a POSITA would find motivation to apply the principles of stable attachment and center of gravity considerations to the second seat attachment in Zehfuss. Goldschmidt et al.'s teaching of attaching a separate component (a ride-along board) to the stroller frame using various attachment mechanisms (e.g., pins, snaps, quick releases) would suggest to a POSITA that similar secure and releasable attachment methods could be used for the second seat attachment of Zehfuss. The emphasis in Goldschmidt et al. on maintaining stability by considering the center of mass within the wheelbase would reinforce Zehfuss's teaching that the front seat should be positioned substantially over the front wheels for stability, and provide a known solution for achieving this. The common problem of securely attaching an auxiliary component to a stroller while maintaining stability would provide the motivation to combine these teachings.