Trademark law usually stipulates that the following forms of marks cannot apply for trademark registration:

1. Common words: ordinary, common words, phrases or expressions that lack originality. Difficult to register as a trademark.

2. Descriptive labels: labels that describe the nature, quality, use, etc. of a product or service and lack significant distinction.

3. General geometric shapes: General geometric shapes lack uniqueness and are difficult to register as trademarks.

4. Pure combinations of numbers or letters: Pure numbers, letters, and combinations of numbers and letters may be difficult to obtain trademark registration unless they have a special composition or arrangement.

5. The national flag, national emblem and their imitations: The national flag, national emblem and signs similar to the national flag and national emblem generally cannot be registered as trademarks.

6. Marks that are likely to cause confusion: Marks that are similar to existing trademarks and are likely to cause confusion are usually difficult to obtain registration.

7. Illegal logos: logos that violate laws and regulations, social order or good customs, usually cannot be registered as trademarks.

Trademark law has certain requirements for registered logos, which must be significantly distinctive and original, and not conflict with existing trademarks. Specific regulations may vary from country to country or region. It is recommended to read the relevant regulations carefully and seek advice from a professional intellectual property lawyer before applying for a trademark.

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