A synthetic resin container with a cylindrical shape, including an oval-shaped nose, a tube shaped trunk and a shoulder that connects the trunk with the mouth. The shoulder is inclined at a angle greater than 120.degree. with respect to an orifice of the mouth The shoulder also has a crystal orientation to a machine direction of less than 1.

Synthetic resin containers (e.g. PET bottles) with a bottle-like shape with a tube-shaped mouth the tube-shaped trunk that has one end that is closed with the bottom, and another shoulder through which the other part of the trunk connects to the mouth. They have been widely employed as containers that hold a variety of liquids, like a seasoning including soy sauce, beverage and cosmetics product shampoo, as well as a liquid detergent.

The container of this synthetic resin can be made by blow molding a preform using pressurized water. The preform has been formed by thermoplastic resin in a bottomed tubular shape. Patent Literature 1 describes, for instance, a resin container made by using a bottomed tubular preform to biaxial stretch molding by using pressurized oxygen to stretch portions that are corresponding to the shoulder, trunk, and bottom in the axial or circular directions, and then forming a bottle form.

Patent Literature

Technical Issue

The shoulder of the container made of synthetic resin with the bottle shape is often a substantially conical shape that is inclined with respect to the axis of the mouth.

The biaxially stretch-blow molded resin container is characterized by an increased angle of inclination for the shoulder in relation to the axis. This means that there is an increase of draw ratio in the direction of machine of a part of the preform that corresponds with the shoulder during blow molding. Therefore, if the vessel has a shape in which the shoulder is inclined towards the axis direction of themouth, the shoulder, even having the same crystallinity is more likely to contract after molding. Especially when the container has an outline in which the shoulder is tilted at an angle higher than 120.degree. The rate of shoulder contraction after molding is greater than the axis that runs through the mouth. This may result in a decrease in the container’s size and the deformation.

To address this issue, the present disclosure was created. The present disclosure provides a synthetic resin container and an approach to making it. This prevents the decrease in size and deformation. It also allows the shoulder to be angled to an angle greater than 120.degree. relative to the jaw’s axis.


One aspect of the disclosed invention resides in a container made of synthetic resin with a bottle-shaped shape, comprising a tube-shaped mouth, a tube-shaped trunk having one end sealed by an upper and a shoulder through which a different end of the trunk isconnected to the mouth, and the shoulder is bent at an angle higher than 120.degree. relative to the axis of the mouth and the shoulder is positioned with an orientation of the crystals in a direction that is less than 1.

In the currently disclosed synthetic resin container with the above design, the mouth could be formed in a substantially cylindrical shape, the trunk could be constructed in a substantially cylindrical shape with a diameter larger than adiameter of the mouth, and the shoulder can be formed in a substantially frustoconical shape.

Polyethylene Terephthalate can be used to make the synthetic resin container described in the above-described arrangement.

Another aspect of the disclosure is the production method for the container made of synthetic resin described above. This involves supplying the preform that is formed by thermoplastic resin in a bottomed tubular shape, a liquid heated at a predetermined temperature and pressure to liquid blow mold it.

Positive Effect

The present invention provides an artificial resin container as well as the method for making the container made of synthetic resin and both of them prevent diminution in volume and deformation by limiting the degree of shoulder contraction while still allowing the shape of the shoulder to be inclined at an angle greater than 120.degree. With respect to the axisof the mouth.

Click here to view the patent on USPTO website.


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The first step in obtaining your patent is to perform the patent search. You can do a google patent search or do a USPTO search. Once the patent application is submitted, the product that is covered by the application can be called patent-pending, and you will be able to locate the patent application online on the public pair. After the patent office approves your application, you will be able do an online search for a patent number and locate the patent issued. Your product is now patentable. Alongside the USPTO search engine, you can use other search engines, such as espacenet, as detailed below. A patent lawyer or patent attorney can assist you with the procedure. In the US, patents are granted by the US patent and trademark office or the United States patent and trademark office, which also examines trademark applications.

Are you looking for similar patents? These are the steps:

1. Create a list of terms for your invention according to its function and composition or usage.

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  • Invention is a method to make something or carry out some function? Are you referring to an item?
  • What is the composition of the invention? What is the physical composition of the invention?
  • What is the goal of the invention
  • What are the terms in the technical field and the keywords that define the nature of an invention? To assist you in finding the appropriate terms, use a technical dictionary.

2. Use these terms to search for relevant Cooperative Patent Classifications at the Classification Text Search Tool. To determine the best classification for your invention, go through the resulting classification’s class Schemes (class schedules). Think about substituting the words that you’ve used to describe your invention if you do not find any results in your Classification Text Search with synonyms such as the terms you used in Step 1.

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5. Use this selection of the most pertinent patent documents to examine each one in depth for any similarity to your idea. Be sure to read the claims and specifications. You may find additional patents by referring to the patent examiner and the applicant.

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7. Find other US patents by keyword searching in PatFT or AppFT databases, classification searching of non-U.S. patents as per below, and searching non-patent patent disclosures in the literature of inventions using internet search engines. Here are some examples:

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To review your search, you can hire a registered patent attorney to assist. A preliminary search will help one better prepare to talk about their invention and other related inventions with a professional patent attorney. In addition, the attorney will not spend too much time or money on patenting basics.