Patents
US 11584969 B2: High fatigue strength components requiring areas of high hardness
- Granted
- 2023-02-21
- Filed
- 2020-03-11 application 16815579
- Type
- Utility · 25 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
Metal components subject to wear or contact fatigue in a first area, and subject to bending, axial and/or torsional stress loading in a second area comprise a surface hardened, first surface layer in the first area, and a surface compressive-stress treated, second surface layer in the second area. The second surface layer has a material hardness different from, and typically lower than, the first surface layer, and induced residual compressive stress to improve fatigue strength. Example components described include a gear, a cog, a pinion, a rack, a splined shaft, a splined coupling, a torqueing tool and a nut driving tool. A hybrid manufacturing process is described, including area-selective surface hardening combined with a process to add compressive stress to fatigue failure prone areas.
Source: PVGPATDIS, file of 2026-04-10 (ipg230221.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 |
CPC categories
| Subclass | Category | First group | Source |
|---|---|---|---|
| C21D | Modifying the physical structure of ferrous metals; general devices for heat treatment of ferrous or non-ferrous metals or alloys; making metal malleable, e.g. by decarburisation or tempering | C21D7/04 | PVGPATDIS, file of 2026-04-10 |
| C22F | Changing the physical structure of non-ferrous metals and non-ferrous alloys | C22F1/183 | PVGPATDIS, file of 2026-04-10 |
| C23C | Coating metallic material; coating material with metallic material; surface treatment of metallic material by diffusion into the surface, by chemical conversion or substitution; coating by vacuum evaporation, by sputtering, by ion implantation or by chemical vapour deposition, in general | C23C8/02 | PVGPATDIS, file of 2026-04-10 |
| Y02P | Climate change mitigation technologies in the production or processing of goods | Y02P10/25 | 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 |
|---|---|---|---|---|---|
| 2020-03-11 | Assignment Assignment of assignor's interest | HACKEL, LLOYD A. signed 2020-03-11 | METAL IMPROVEMENT COMPANY, LLC PARAMUS, NJ | 52085/545 | 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.