Intellectual Property

Boston College Law School

March 5, 2007

Patent – Infringement 2

Doctrine of Equivalents

• Tests– Substantially same function, way, result– Insubstantial differences

• Evidence– Circumstances, purpose, prior art– Would PHOSITA have viewed interchangeable?

• Details– All-elements rule– Measured at time of infringement

Patent No. 5,205,473

Patent No. 5,205,473

• “What is claimed is:– 1. A recyclable, insulating beverage

container holder, comprising:• a corrugated tubular member comprising

– cellulosic material and at least a first opening therein for receiving and retaining a beverage container, said corrugated tubular member comprising

• fluting means for containing insulating air; said fluting means comprising fluting adhesively attached to a liner with a recylable adhesive

Doctrine of Equivalents

• Limitations– Claim on prior art– Prosecution history estoppel– Disclosed but not claimed

Warner Jenkinson

pH

9.08.07.06.05.0

BoothHilton

OriginalHilton

Amended Warner

?

Festo

• Two issues– What kinds of amendments trigger estoppel?– Does estoppel apply to all equivalents based on

the amendment?

Doctrine of Equivalents

Claims

Prior Art

ProsecutionHistoryEstoppel

Equivalentsfor PioneerInvention

Equivalentsfor MinorInvention

Patent No. 5,205,473

Patent No. 5,205,473

• “What is claimed is:– 1. A recyclable, insulating beverage

container holder, comprising:• a corrugated tubular member comprising

– cellulosic material and at least a first opening therein for receiving and retaining a beverage container, said corrugated tubular member comprising

• fluting means for containing insulating air; said fluting means comprising fluting adhesively attached to a liner with a recylable adhesive

Patent No. 5,425,497

Problem 3-11• “1. A pocket toothbrush having an exterior structure

resembling a traditional fountain pen case comprising– a. a removable cylindrical end cap cover,

– b. a main cylindrical body shaft over at least one end of which said end cap cover fits …,

– c. said cylindrical body shaft having one end which contains toothbrush bristles …,

– d. said cylindrical body shaft including an interior passage extending into said bristle end and having at least one termination opening in the area at the base of said bristles,

– e. a movable plunger extending into said cylindrical body shaft in said main cylindrical body shaft,

– f. said body shaft including an interior space for the accommodation of a charge of toothpaste to be fed to said bristles by operation of said movable plunger …”

Administrative

• Assignment for next class– Finish IV.C – Infringement

• No class this Friday– Will reschedule

Patent Scope

Claims

Prior Art

ProsecutionHistoryEstoppel

Equivalents

Reverse Doctrineof Equivalents