Patents
US 11740176 B2: Fast and accurate mueller matrix infrared spectroscopic ellipsometer
- Granted
- 2023-08-29
- Filed
- 2022-01-18 application 17803029
- Type
- Utility · 27 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
An ellipsometer, polarimeter and the like system operating in the infrared spectral range (0.75 μm to 1000 μm), utilizing a tunable quantum cascade laser (QCL) source in combination with dithering capability to reduce speckle and standing wave effects, dual-rotating optical elements, a single-point detector, as well as optional means of reducing the size of the probe beam at the measurement surface and optional chopper for lock-in detection.
Source: PVGPATDIS, file of 2026-04-10 (ipg230829.xml).
Assignees
| Assignee | Type | Place | Also on furp.org | Source |
|---|---|---|---|---|
| J.A. WOOLLAM CO., INC. 108 patents | US company or organization | Lincoln, NE | J.A. WOOLLAM CO., INC. State business registration EXACT high confidence: identical full name and state | PVGPATDIS, file of 2026-04-10 |
Inventors
| Inventor | Place | Patents | Person page | Source |
|---|---|---|---|---|
| Stefan Schoeche | Lincoln, NE | 9 | PVGPATDIS, file of 2026-04-10 | |
| Craig M. Herzinger | Lincoln, NE | 36 | PVGPATDIS, file of 2026-04-10 | |
| Steven E. Green | Lincoln, NE | 8 | PVGPATDIS, file of 2026-04-10 | |
| Martin M. Liphardt | Lincoln, NE | 78 | PVGPATDIS, file of 2026-04-10 | |
| James D. Welch | Omaha, NE | 52 | PVGPATDIS, file of 2026-04-10 |
CPC categories
| Subclass | Category | First group | Source |
|---|---|---|---|
| G01N | Investigating or analysing materials by determining their chemical or physical properties | G01N21/211 | 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 |
|---|---|---|---|---|---|
| 2022-04-19 | Assignment Assignment of assignor's interest | GREEN, STEVEN E. signed 2022-02-04 HERZIGER, CRAIG M. signed 2022-02-04 LIPHARDT, MARTIN M. signed 2022-02-04 SCHOECHE, STEFAN signed 2022-02-04 WELCH, JAMES D. signed 2022-02-04 | J.A. WOOLLAM CO., INC. LINCOLN, NE | 60802/45 | 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.