Partially degradable particulates as time-released tracers for acidized and fractured gas wells
US-2024209729-A1 · Jun 27, 2024 · US
Foams
Foams · Cooperative Patent Classification (CPC)
Chemical and metallurgical processes, compounds, and materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | C09K8/94 |
| Official title | Foams |
| Display label | Foams |
| Total patents | 259 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 13 |
| 2016 | 11 |
| 2017 | 19 |
| 2018 | 19 |
| 2019 | 28 |
| 2020 | 36 |
| 2021 | 35 |
| 2022 | 27 |
| 2023 | 28 |
| 2024 | 21 |
| 2025 | 17 |
| 2026 | 5 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method for Preparing Compound Dispersoids of Hydrophobic Nanoparticles and Surfactants
US-2018333692-A1 · Nov 22, 2018 · US
In situ solid organic pillar placement in fracture networks
US-2018298271-A1 · Oct 18, 2018 · US
Multifunctional foaming composition with wettability modifying, corrosion inhibitory and mineral scale inhibitory/dispersants properties for high temperature and ultra high salinity
US-2018273830-A1 · Sep 27, 2018 · US
Emulsions containing water-soluble acid retarding agents and methods of making and using
US-2018244980-A1 · Aug 30, 2018 · US
Use of Gaseous Phase Natural Gas as a Carrier Fluid During a Well Intervention Operation
US-2018238153-A1 · Aug 23, 2018 · US
Siloxane surfactant additives for oil and gas applications
US-10053619-B2 · Aug 21, 2018 · US
Forming proppant packs having proppant-free channels therein in subterranean formation fractures
US-10047281-B2 · Aug 14, 2018 · US
Alpha-olefin sulfonic dimer acid process
US-2018222854-A1 · Aug 9, 2018 · US
Device for evaluating foaming property of gas-soluble surfactant and application thereof
US-10006845-B2 · Jun 26, 2018 · US
Composition of an organic foaming additive for high temperature and high salinity
US-2018171215-A1 · Jun 21, 2018 · US
Chelating etching agent stimulation and proppant stabilization of low-permeability subterranean formations
US-2018127640-A1 · May 10, 2018 · US
Microbubbles for heat and/or gas generation in subterranean formations
US-2018127641-A1 · May 10, 2018 · US
Syntactic foam frac ball and methods of using same
US-9920585-B2 · Mar 20, 2018 · US
Forming proppant packs having proppant-free channels therein in subterranean formation fractures
US-2018044577-A1 · Feb 15, 2018 · US
Methods of preparing treatment fluids comprising anhydrous ammonia for use in subterranean formation operations
US-2018030340-A1 · Feb 1, 2018 · US
Foam assisted liquid removal using alcohol ether sulfonates
US-9862882-B2 · Jan 9, 2018 · US
Foamed fluid compositions having high salinity using anionic surfactants and methods therefor
US-9828815-B2 · Nov 28, 2017 · US
Y-grade ngl stimulation fluids
US-2017298268-A1 · Oct 19, 2017 · US
Hydrocarbon based carrier fluid
US-2017292057-A1 · Oct 12, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C09K8/94?
- CPC C09K8/94 is the Cooperative Patent Classification code for “Foams.”
- How many patents are filed under CPC C09K8/94 (Foams)?
- Our database includes 259 publications tagged with this CPC code.
- Is patent activity under CPC C09K8/94 growing?
- Publication counts under this code: 21 in 2024 vs 17 in 2025 (latest complete years).