Patents
US 10829938 B2: Roofing membranes with expandable graphite as flame retardant
- Granted
- 2020-11-10
- Filed
- 2017-03-22 application 15466306
- Type
- Utility · 18 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
A roofing membrane comprising at least one layer of a cured rubber and expandable graphite dispersed within the cured rubber.
Source: PVGPATDIS, file of 2026-04-10 (ipg201110.xml).
Assignees
| Assignee | Type | Place | Also on furp.org | Source |
|---|---|---|---|---|
| Firestone Building Products Company, LLC 136 patents | US company or organization | Indianapolis, IN | PVGPATDIS, file of 2026-04-10 |
Inventors
| Inventor | Place | Patents | Person page | Source |
|---|---|---|---|---|
| Hao Wang | Carmel, IN | 69 | PVGPATDIS, file of 2026-04-10 | |
| Wensheng Zhou | Carmel, IN | 36 | PVGPATDIS, file of 2026-04-10 | |
| Joseph CARR | Indianapolis, IN | 28 | PVGPATDIS, file of 2026-04-10 |
CPC categories
| Subclass | Category | First group | Source |
|---|---|---|---|
| E04D | Roof coverings; sky-lights; gutters; roof-working tools | E04D5/10 | PVGPATDIS, file of 2026-04-10 |
| B32B | Layered products, i.e. products built-up of strata of flat or non-flat, e.g. cellular or honeycomb, form | B32B25/02 | PVGPATDIS, file of 2026-04-10 |
| C08K | Use of inorganic or non-macromolecular organic substances as compounding ingredients | C08K3/04 | PVGPATDIS, file of 2026-04-10 |
| E04B | General building constructions; walls, e.g. partitions; roofs; floors; ceilings; insulation or other protection of buildings | E04B1/94 | 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 |
|---|---|---|---|---|---|
| 2025-08-29 | Assignment Assignment of assignor's interest | HOLCIM TECHNOLOGY LTD signed 2025-06-01 | AMRIZE TECHNOLOGY SWITZERLAND LLC ZUG | 72740/505 | ECORSEXC, file of 2026-09-25 |
| 2022-07-06 | Assignment Assignment of assignor's interest | FIRESTONE BUILDING PRODUCTS COMPANY, LLC signed 2022-04-04 | HOLCIM TECHNOLOGY LTD 6300 ZUG | 61034/752 | ECORSEXC, file of 2026-09-25 |
| 2017-03-22 | Assignment Assignment of assignor's interest | WANG, HAO signed 2014-06-13 CARR, JOSEPH signed 2014-07-22 ZHOU, WENSHENG signed 2014-07-22 | FIRESTONE BUILDING PRODUCTS CO., LLC INDIANAPOLIS, IN | 41685/68 | 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.