Patents
US 8608590 B2: Engineered residual stress in golf clubs
- Granted
- 2013-12-17
- Filed
- 2007-06-14 application 12304106
- Type
- Utility · 41 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
A method of manufacturing a driver, or other types of golf club, includes inducing residual compressive stress by high intensity laser shock peening to form an array of laser shock peened impact zones on the club face. Laser pulses having irradiance greater than 4 GW/cm2, with spot size greater than 4 mm2 are used, including a pulse with on the order of 16 ns, with spot size greater than 9 mm2. Residual compressive stress of more than 400 MPa penetrating with a depth of more than 0.2 mm are imparted, without increased hardening in or damage to the face of the club. Laser shock peening a pattern that covers an interior area leaves the perimeter unpeened, inducing a stress gradient between interior area and the perimeter of the club face. Multiple layers of arrays of laser shock impact zones are applied on the club. The technology is readily applied to assembled club heads.
Source: PVGPATDIS, file of 2026-04-10 (ipg131217.xml).
Assignees
| Assignee | Type | Place | Also on furp.org | Source |
|---|---|---|---|---|
| METAL IMPROVEMENT COMPANY, LLC 12 patents | US company or organization | Paramus, NJ | PVGPATDIS, file of 2026-04-10 |
Inventors
| Inventor | Place | Patents | Person page | Source |
|---|---|---|---|---|
| Lloyd Hackel | Livermore, CA | 8 | PVGPATDIS, file of 2026-04-10 | |
| Jon Rankin | Dublin, CA | 3 | PVGPATDIS, file of 2026-04-10 | |
| Chanh H. Truong | Hayward, CA | 2 | PVGPATDIS, file of 2026-04-10 | |
| C. Brent Dane | Livermore, CA | 6 | PVGPATDIS, file of 2026-04-10 | |
| Fritz B. Harris | Rocklin, CA | 5 | PVGPATDIS, file of 2026-04-10 |
CPC categories
| Subclass | Category | First group | Source |
|---|---|---|---|
| A63B | Apparatus for physical training, gymnastics, swimming, climbing, or fencing; ball games; training equipment | A63B53/04 | PVGPATDIS, file of 2026-04-10 |
Cooperative Patent Classification, as currently assigned (one row per subclass).
Assignments and security interests
| Recorded | What | From | To | Reel/frame | Source |
|---|---|---|---|---|---|
| 2008-12-09 | Assignment Assignment of assignor's interest | HACKEL, LLOYD A. signed 2008-12-04 TRUONG, CHANH H. signed 2008-12-04 DANE, C. BRENT signed 2008-12-05 RANKIN, JON signed 2008-12-05 HARRIS, FRITZ B., JR. signed 2008-12-08 | METAL IMPROVEMENT COMPANY, LLC PARAMUS, NJ | 21950/299 | ECORSEXC, file of 2026-09-25 |
Documents recorded with the USPTO Assignment Recordation Branch that list this patent. A security interest is a lender’s claim on the patent as collateral; a release ends it.
USPTO bulk data: PatentsView granted patents, disambiguated (PVGPATDIS) for patents, assignees, inventors, places and CPC categories; the USPTO Patent Assignment Dataset (ECORSEXC) for assignments and security interests. Patents filed in the last 20 years. No claims or full text. Links to other records are by name (and state): EXACT means the identical full name and state; FUZZY means a looser name match, with the confidence shown.