Patents
US 11391666 B1: Snapshot ellipsometer
- Granted
- 2022-07-19
- Filed
- 2020-04-06 application 16873386
- Type
- Utility · 25 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
A snapshot ellipsometer or polarimeter which does not require temporally modulated element(s) to measure a sample, but instead uses one or more spatially varying compensators, (eg. microretarder arrays and compound prisms), to vary the polarization state within a measurement beam of electromagnetic radiation. Analysis of an intensity profile of the beam after interaction with the spatially varying compensator(s) and the sample, and after having source beam wavelength content determined using a digital light processor, and/or being directed by a digital light processor elements toward elements in the detector, allows sample parameters to be characterized.
Source: PVGPATDIS, file of 2026-04-10 (ipg220719.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 |
|---|---|---|---|---|
| Griffin A. P. Hovorka | Lincoln, NE | 4 | PVGPATDIS, file of 2026-04-10 | |
| Jeremy A. Van Derslice | Dwight, NE | 9 | PVGPATDIS, file of 2026-04-10 | |
| Martin M. Liphardt | Morse Bluff, NE | 78 | 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 |
| G02B | Optical elements, systems or apparatus | G02B5/3083 | 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 | HOVORKA, GRIFFIN A. P. signed 2020-03-19 VAN DRSLICE, JERENY signed 2020-03-19 LIPHARDT, MARTIN M. signed 2020-03-27 | J.A. WOOLLAM CO., INC. LINCOLN, NE | 60765/384 | 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.