At a glance
| Patent number | CN209360543U (application CN201821956108) |
| Type | China utility model (实用新型) - protects product shape and structure |
| Original title | Rotary magnetism-adjustable safety glass cleaner (旋转调磁安全擦玻璃器) |
| Patent owner | Dalian Qixiang Technology Co., Ltd. (大连奇想科技有限公司) |
| Inventor | Liu Zhongchen |
| Priority date | 2018-01-02 |
| Filing date | 2018-11-26 |
| Grant date | 2019-09-10 |
| Status (China) | Lapsed - terminated for non-payment of annual fees (recorded 2025-11-21) |
| Patent family | Chinese filings only - no US, European, Japanese, PCT or other filings listed |
| Cited by | 2 later documents |
| Source | Google Patents (search for CN209360543U) |
What the claims cover, in plain language
Claim 1 - a glass cleaner with a housing of upper cover and lower shell, a felt pad and wiper strip on the lower shell, and a permanent magnet on a magnetic plate inside. The key point: a guide frame around an opening in the lower shell, in which the magnet, plate, a magnet carrier and a sealed box can slide up and down.
Claim 2 - a jump-off spring on the carrier or sealed box that holds up the magnet assembly. Claim 3 - the carrier is fixed to the sealed box with a sealing ring between them. Claim 4 - the sealing ring is rectangular or curved, with a recessed solid in the middle of each side containing a round hole.
The patent description also covers the magnetic dial, button and latch, but the claims above define what was protected. This is a simplified reading for orientation only. The legal scope is defined by the exact claim wording in the official Chinese document.
What this means for US production
This patent was filed only in China, and it lapsed in 2025 because annual fees were not paid. It no longer restricts anyone - in China or elsewhere.
Before production, keep in mind:
- Other patents may exist. Magnetic window cleaners with adjustable magnets are made by several companies that hold patents in the US, Europe and Asia. Use your own styling and have a freedom-to-operate (FTO) search done by a US patent attorney before volume production.
Customization and manufacturing
What can be customized
| Area | Options |
|---|---|
| Glass range | Number of dial steps and magnet size set for the glass thicknesses you target |
| Magnet | Neodymium grade and size, sealed as in the patent |
| Size & shape | Compact or large cleaning faces; triangular or rectangular |
| Pads | Felt, microfiber or scrubbing pads; replaceable pad packs |
| Squeegee | Rubber or silicone wiper strip |
| Safety cord | Tether between the two halves to catch the outside half |
| Colors & branding | Housing colors, printed dial markings, logo |
| Packaging | Retail box with glass-thickness guide |
Things to plan for (US market)
- Strong magnets - include warnings about pinching and about keeping magnets away from pacemakers, cards and electronics; keep magnets fully enclosed.
- Drop risk - a safety cord for the outside half is strongly recommended for upper floors.
- Claims - state the glass-thickness range that was actually tested.
How a project runs
- Inquiry - glass range, size, magnet and quantity.
- Design - housing, dial steps, latch and seal.
- Prototype - samples tested on different glass thicknesses.
- Pilot run - small batch to check magnet force, sealing and latch reliability.
- Production - volume production, packaging and shipping.
Quantities & timeline
Housings, dial, button and seal box are injection-molded; magnets are a bought-in part. Send us your glass range, size, quantity and target price and we will reply with options.
Patent drawings
Drawings reproduced from the public patent document for reference.
