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1. (WO2018128773) PISTON COMPRESSION RINGS OF COPPER-BERYLLIUM ALLOYS
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CLAIMS:

1 . A piston ring formed from a copper-containing alloy that comprises copper and beryllium.

2. The piston ring of claim 1 , wherein the copper-containing alloy further comprises cobalt.

3. The piston ring of claim 2, wherein the copper-containing alloy further comprises zirconium.

4. The piston ring of claim 1 , wherein the copper-containing alloy further comprises nickel.

5. The piston ring of claim 4, wherein the copper-containing alloy further comprises cobalt.

6. The piston ring of claim 5, wherein the copper-containing alloy further comprises iron.

7. The piston ring of claim 1 , wherein the copper-containing alloy is a copper-beryllium-cobalt-zirconium alloy that contains:

about 0.2 wt% to about 1 .0 wt% beryllium;

about 1 .5 wt% to about 3.0 wt% cobalt;

about 0.1 wt% to about 1 .0 wt% zirconium; and

balance copper.

8. The piston ring of claim 1 , wherein the copper-containing alloy is a copper-beryllium-cobalt-nickel alloy that contains:

about 0.2 wt% to about 1 .0 wt% beryllium;

about 0.5 wt% to about 1 .5 wt% cobalt;

about 0.5 wt% to about 1 .5 wt% nickel; and

balance copper.

9. The piston ring of claim 1 , wherein the copper-containing alloy is a copper-beryllium-nickel alloy that contains:

about 0.1 wt% to about 1 .0 wt% beryllium;

about 1 .1 wt% to about 2.5 wt% nickel; and

balance copper.

10. The piston ring of claim 1 , wherein the copper-containing alloy is a copper-beryllium-cobalt alloy that contains:

about 0.2 wt% to about 1 .0 wt% beryllium;

about 2.0 wt% to about 3.0 wt% cobalt; and

balance copper.

1 1 . The piston ring of claim 1 , wherein the copper-containing alloy is a copper-beryllium-cobalt alloy that contains:

about 1 .1 wt% to about 2.5 wt% beryllium;

about 0.1 wt% to about 0.5 wt% cobalt; and

balance copper.

12. The piston ring of claim 1 , wherein the copper-containing alloy is a copper-beryllium-containing alloy that contains:

about 1 .5 wt% to about 2.5 wt% beryllium;

an amount of nickel, cobalt, and iron such that the sum of (nickel+cobalt) is about 0.2 wt% or higher, and the sum of (nickel+cobalt+iron) is about 0.6 wt% or less; and

balance copper.

13. The piston ring of claim 1 , wherein the piston ring is uncoated.

14. The piston ring of claim 1 , having a rectangular or trapezoidal cross-section.

15. The piston ring of claim 1 , having a butt cut, an angle cut, an overlapped cut, or a hook cut.

16. The piston ring of claim 1 , wherein the piston ring weighs up to about 0.25 pounds.

17. The piston ring of claim 1 , wherein the piston ring weighs from about 0.25 pounds to about 1 .0 pound.

18. A piston assembly, comprising:

a piston body comprising a top ring groove; and

a piston ring in the top ring groove, the piston ring being formed from a copper-containing alloy that comprises copper and beryllium.

19. A method of improving engine efficiency, comprising using a piston assembly in an engine, the piston assembly comprising:

a piston body comprising a top ring groove; and

a piston ring in the top ring groove, the piston ring being formed from a copper-containing alloy that comprises copper and beryllium.

20. A method of making a piston ring, comprising:

forming the piston ring from a copper-containing alloy that comprises copper and beryllium.