Introduction to Claiming and Disclosing and PHOSITA - Week 1

PHOSITA

hypothetical figure used to evaluate key patent law standards, including claim meaning, disclosure sufficiency, novelty, non-obviousness, and infringement

Daiichi Sankyo v. Apotex Patent Background

Daiichi's patent covers a method of treating bacterial ear infections by applying the antibiotic topically into the ear. Claim 1 specifies administering an effective amount of ofloxacin using a pharmaceutically acceptable carrier.

Obviousness Four Factors

Four Factors:

(1) Scope and content of prior art;

(2) Differences between prior art and the claims;

(3) Level of ordinary skill in the pertinent art;

(4) Secondary considerations such as commercial success or long-felt but unsolved needs.

Daiichi Dispute

The district court defined the PHOSITA as a pediatrician or general practitioner who treats ear infections. Apotex argued the PHOSITA should instead be a pharmaceutical developer or ear specialist trained in drug formulations, which would render patent obvious.

Six PHOSTIA Factors

Inventor education,

types of problems encountered in the art,

prior art solutions to those problems,

innovation speed,

sophistication of technology,

educational level of active workers in the field

These factors serve as a flexible guide rather than an exhaustive checklist.

Court Reasoning

Creating ear medications requires specialized drug development and safety testing to ensure the compound does not cause hearing damage. Because active researchers in the field were pharmaceutical specialists rather than general doctors, the district court erred by defining the PHOSITA as a general practitioner

Stryker Corp. v. Hill-Rom Services, Inc. Background

The patent describes a hospital bed containing inflatable mattress bladders, a pressure control system, and a Controller Area Network (CAN). The bed uses established network communication protocols developed prior to the patent. Claim 1 is the sole independent claim defining a hospital bed with inflatable bladders, a pressure controller, and a CAN network with modules connected by a serial bus.

Dispute surrounding Stryker

Hill-Rom argued that a skilled worker would lack the technical knowledge to implement CAN networks in hospital beds without additional guidance. They claimed the examiner failed to establish a clear standard for the PHOSITA's skill level.

Exaimner’s PHOSITA Determination

The examiner found that a PHOSITA must understand advanced scientific and engineering principles because hospital beds are complex systems.

The examiner noted that skill is measured by technical capability rather than formal degrees or years of experience. Furthermore, the PHOSITA's knowledge extends to communication networks used in other fields outside hospital beds.

PTAB’s Reasoning of PHOSITA

Board agreed that the field was multidisciplinary, spanning both medical devices and network communications.

Literature Support: Technical publications confirmed that CAN networks were already actively implemented in medical devices.

Applying network communications to medical equipment was not a brand-new field. Therefore, the PHOSITA was not simply a medical device designer, but someone knowledgeable in network communication systems

Inventor qualifications help determine the PHOSITA standard, and lead inventor Steven Dixon held a degree in electrical engineering technology. Dixon's testimony confirmed his familiarity with implementing serial networks in hospital beds.

Key active workers in the field, including inventor Dixon and competitor engineer Michael Hayes, both held bachelor's degrees in electrical engineering. Based on this, the Board established that the hypothetical PHOSITA holds at least a bachelor's degree in electrical engineering.

Industry Worker Practices: Competitor engineer Michael Hayes used prior networking experience to develop hospital beds and regularly stayed informed through technical journals and industry groups. This demonstrated that active workers in this field actively drew from broader networking knowledge.

PTAB’s Final PHOSITA Defintion

The Board defined the PHOSITA as an electrical engineer with at least a bachelor's degree working across medical devices and communications. This person understood CAN networks and how to adapt them to medical equipment.

Section 112 Disclosure

Section 112 disclosure requirements sit at the heart of patent law's mission to promote the progress of useful arts. Requiring clear claims and sufficient disclosure to skilled artisans facilitates the dissemination of technical knowledge and encourages follow-on innovation.

Claim vs. Specification

While the specification teaches what an invention is and how to make and use it, the claims serve to give public notice of the exact legal scope protected.

Claim Interpretation

Fundamental to assessing patent validity and infringement. Clear, predictable claim interpretation rules enable competitors to assess freedom to operate, pursue design-arounds, calculate royalty rates, or determine if a license is required.