CPC technology class · D04
D04G — Making NETS BY Knotting OF Filamentary Material
Making nets by knotting of filamentary material; making knotted carpets or tapestries; knotting not otherwise provided for. 19 US utility patents granted 2015–2025, with the leading assignees and year-by-year filing trajectory.
- 19
- US patents granted
- D04
- Parent CPC class
- 2
- Active assignees
- -10%
- 5-yr velocity
CPC subclass D04G — MAKING NETS BY KNOTTING OF FILAMENTARY MATERIAL; MAKING KNOTTED CARPETS OR TAPESTRIES; KNOTTING NOT OTHERWISE PROVIDED FOR — covers 19 US utility patents granted between 2015 and 2025 according to USPTO PatentsView records. This subclass sits within the broader CPC class D04 (BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS), one of roughly 250 top-level technology categories in the Cooperative Patent Classification system jointly maintained by the USPTO and the European Patent Office. At the subclass level, four-character codes like D04G give the most practical resolution for tracking a specific technology domain without losing sight of adjacent filings. Every grant here has been classified by a USPTO examiner based on the technical disclosure in the patent specification.
The competitive landscape in D04G is shaped by 2 distinct companies actively filing in this space. SMITH & NEPHEW, INC. leads with 6 patents, followed by NINE IP LIMITED at 15 grants. Concentration at the top of the leaderboard indicates whether this technology area is dominated by a handful of incumbents or fragmented across many filers — a useful signal for investors evaluating competitive moats and for product teams mapping freedom-to-operate risk.
Filing trajectory matters as much as static counts. The yearly series on this page plots grants from 2015 through 2025, highlighting whether innovation in D04G is accelerating, plateauing, or cooling. Technology areas with rising post-2020 activity often reflect emerging markets or new platform shifts, while declining filings can signal mature domains where incremental improvement has slowed. Researchers, licensing professionals, and competitive-intelligence teams use these patterns — together with the top-assignee distribution — to decide where to invest, where to license, and where to avoid entanglement. All counts on this page come directly from USPTO PatentsView and reflect US granted utility patents only.
Is D04G innovation accelerating?
US utility-patent grants per year in D04G, 2015–2025 — recent five years are down 10% versus 2015–2019.
Who leads D04G?
The 12 most active assignees in MAKING NETS BY KNOTTING OF FILAMENTARY MATERIAL; MAKING KNOTTED CARPETS OR TAPESTRIES; KNOTTING NOT OTHERWISE PROVIDED FOR — wider bars mean more grants
- Hampidjan hf
Hampidjan hf.
15 patents
- Nine Ip
NINE IP LIMITED
15 patents
What this shows Smith & Nephew is the most active filer in D04G, holding 6 of the 19 patents in this class. Concentration at the top signals how contestable this technology area is for new entrants.
View data table
| Rank | Company | Patents in D04G |
|---|---|---|
| #1 | Hampidjan hf. | 15 |
| #2 | NINE IP LIMITED | 15 |
About This Class
CPC subclass D04G belongs to class D04.
19 patents were granted in this class between 2015 and 2025.
2 companies actively patent in this space.
Classification System
Cooperative Patent Classification (CPC) is a hierarchical patent classification system used by the USPTO and EPO.
Frequently Asked Questions
What is CPC class D04G?
How many patents have been filed in D04G?
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Read our methodology — how this data is sourced, computed, and verified.