# US 2009/0260522 A1 · Portafilter for espresso machine

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- Number: US 2009/0260522 A1
- Document ID: US20090260522A1
- Status: Published application
- Kind: A1
- Application number: 12/311,070
- Filed: 2007-09-20
- Published: 2009-10-22
- Earliest claimed: 2006-09-20
- Inventors: Jens Brine; Aldo Castiglione
- Web page: https://patentgrep.com/patent/US20090260522A1

## CPC

- A47J 31/0663: {to be used with loose coffee (A47J31/0689 takes precedence)}
- A47J: KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES

## Abstract

The present invention relates to portafilter (1) for an espresso machine, which portafilter (1) is made of brass and comprises an inner surface, wherein the inner surface of the portafilter is coated first with a layer of primer (2) and then a layer of fluoropolymer (3) and wherein the layer of primer (2) enables attachment of the layer of fluoropolymer (3) to the inner surface of the portafilter (1).

## Claims

### Claim at position 1

1-12. (canceled)

### Claim 13

Portafilter for an espresso machine, which portafilter is made of brass and comprises an inner surface, wherein the inner surface of the portafilter is coated first with a layer of primer and then a layer of fluoropolymer, wherein the layer of primer enables attachment of the layer of fluoropolymer to the inner surface of the portafilter.

### Claim 14 (depends on 13)

Portafilter according to claim 13, wherein the fluoropolymer is accepted to be used in food applications.

### Claim 15 (depends on 13)

Portafilter according to claim 13, wherein the fluoropolymer is chosen from the group consisting of a polytetrafluoroethylene (PTFE) polymer, perfluoroalkoxy (PFA) polymer or a fluoroethylenepropylene (FEP) polymer or a mixture thereof.

### Claim 16 (depends on 15)

Portafilter according to claim 15, wherein the fluoropolymer is polytetrafluoroethylene (PTFE) polymer (Teflon®) or a mixture of polytetrafluoroethylene (PTFE) polymer (Teflon®) and another fluoropolymer.

### Claim 17 (depends on 13)

Portafilter according to claim 13, wherein the layer of primer is a slurry sprayed inorganic layer or a plasma sprayed inorganic layer or a combination thereof.

### Claim 18 (depends on 13)

Portafilter according to claim 13, wherein the primer is made of a ceramic material.

### Claim 19 (depends on 13)

Portafilter according to claim 13, wherein the fluoropolymer is chosen from the group consisting of a polytetrafluoroethylene (PTFE) polymer, perfluoroalkoxy (PFA) polymer or a fluoroethylenepropylene (FEP) polymer or a mixture thereof and the primer is made of a ceramic material.

### Claim 20 (depends on 13)

Portafilter according to claim 13, wherein the fluoropolymer is polytetrafluoroethylene (PTFE) polymer (Teflon®) or a mixture of polytetrafluoroethylene (PTFE) polymer (Teflon®) and another fluoropolymer and the primer is made of a ceramic material.

### Claim 21 (depends on 13)

Portafilter according to claim 13, wherein the primer is a metal, metal alloy or a metallic material.

### Claim 22 (depends on 13)

Portafilter according to claim 13, wherein the fluoropolymer is chosen from the group consisting of a polytetrafluoroethylene (PTFE) polymer, perfluoroalkoxy (PFA) polymer or a fluoroethylenepropylene (FEP) polymer or a mixture thereof and the primer is a metal, metal alloy or a metallic material.

### Claim 23 (depends on 13)

Portafilter according to claim 13, wherein the fluoropolymer is polytetrafluoroethylene (PTFE) polymer (Teflon®) or a mixture of polytetrafluoroethylene (PTFE) polymer (Teflon®) and another fluoropolymer and the primer is a metal, metal alloy or a metallic material.

### Claim 24 (depends on 21)

Portafilter according to claim 21, wherein the primer comprises iron (Fe) or an alloy thereof.

### Claim 25 (depends on 21)

Portafilter according to claim 21, wherein the primer comprises steel or an alloy thereof.

### Claim 26 (depends on 21)

Portafilter according to claim 21, wherein the primer comprises stainless steel or an alloy thereof.

### Claim 27 (depends on 21)

Portafilter according to claim 21, wherein the primer comprises copper (Cu) or an alloy thereof.

### Claim 28 (depends on 21)

Portafilter according to claim 21, wherein the primer comprises aluminium (Al) or an alloy thereof.

### Claim 29 (depends on 13)

Portafilter according to claim 13, wherein the layer of primer is a slurry sprayed inorganic layer or a plasma sprayed inorganic layer or a combination thereof and the primer comprises steel or an alloy thereof.

### Claim 30 (depends on 13)

Portafilter according to claim 13, wherein the layer of primer is a slurry sprayed inorganic layer or a plasma sprayed inorganic layer or a combination thereof and the primer is made of a ceramic material.