Patents
Patents and certificates, in the open.
We sell to brands and distributors, so the first thing you want to know is who actually owns the design. Here is the number, what it covers, and a list you can download and check yourself.
The two companies are one team: HK 4 Degree Co., Ltd. designs and exports, Foshan Mia Electrical Appliance Manufacturing Co., Ltd. makes. Patents filed under either name are counted together.
The full list (PDF)
Every patent in force, with application number, publication number, filing date and expiry — 56 entries, updated 24 September 2026.
What they actually cover
Gas in, water stays out
One-way air admission and the gas supply unit — the mechanism that lets the machine carbonate juice, tea or fruit without the drink running back into the machine.
Two-phase pressure release
Automatic and manual release, slow then fast, so nothing sprays when you open the bottle.
Bottle and bottle lock
The hanging bottle that lines itself up with the gas port, the wide-mouth bottle you can drop fruit into, and the 17 bar bottle.
Cream machine and CO₂ parts
Locking structures, gas valves, quick-connect cylinders and the 8 g capsule line.
Why this list matters when you are the buyer
A patent list is not a trophy cabinet. For a brand owner placing an order, it answers four questions that a catalogue never does.
You can see who owns it
A supplier who licensed the design from somewhere else appears on the patent as a licensee, not an applicant. Every entry in our list carries 4° or MIA as the applicant, because we filed it.
You can tell protected from ordinary
Half of what a catalogue calls “patented” is a hinge. This page names the four things that are actually protected — and, just as usefully, tells you what is not.
You can check it before you sign
The list has application and publication numbers. Look them up at CNIPA yourself, or hand the PDF to your lawyer. We would rather you did.
It tells you what we can defend
If a competitor copies the one-way gas admission or the click-and-hang bottle lock, there is a registered right behind it. That is the difference between a complaint and a case.
Check it yourself, in three steps
- STEP 1Download the list
One PDF, 56 entries in force, each with the applicant, filing date and publication number.
- STEP 2Pick a number
Take any application number — for example the one-way gas admission patent on the mix line.
- STEP 3Look it up at CNIPA
Search the number at the China National Intellectual Property Administration. It is public, and it is the same document we hold.
Certificates
ISO 9001 and ISO 14001 (issued 2025-08-12, valid to 2028-08-05, scope: R&D and assembly of soda makers), BSCI social audit, packaging PPWR, LFGB, RoHS, REACH, FDA, PET GB 4806.6, CO₂ CoS and MSDS, TPED and DOT for cylinders. Scans of the originals are on the Why 4° page.
Not sure which of these your market will ask for? There is a guide on what importers ask for and how to verify each document.
Want a signed copy for your legal file, or a patent-to-model mapping? Ask us — we answer with the document, not a brochure.