Refill for writing implements and writing implements using the same
US-11135868-B2 · Oct 5, 2021 · US
Ink storage member for writing implements
US2025313034A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2025313034-A1 |
| Application number | US-202318865009-A |
| Country | US |
| Kind code | A1 |
| Filing date | May 2, 2023 |
| Priority date | May 19, 2022 |
| Publication date | Oct 9, 2025 |
| Grant date | — |
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- Title
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Abstract
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An ink storage member for writing implements may reduce environmental impact by replacing the conventional aluminum with silica for the intermediate layer between the inner and the outer layer, both of which use paper as a base material, in a paper refill for writing implements. An ink storage member for writing implements may have at least three layers, including an inner layer of a paper base material, an intermediate layer formed on an outer surface of the inner layer, and an outer layer of the paper base material formed on an outer surface of the intermediate layer. The intermediate layer may have at least one layer selected from an aluminum oxide film layer, a silica film layer formed from a low molecular weight silane, and a silica film layer formed from a polysilazane.
First claim
Opening claim text (preview).
1 . An ink storage member configured for writing implements, the ink storage member comprising: an inner layer comprising a paper base material; an intermediate layer formed on an outer surface of the inner layer; and an outer layer comprising the paper base material formed on an outer surface of the intermediate layer, wherein the intermediate layer comprises an aluminum oxide film layer, a silica film layer formed from a low molecular weight silane, and/or a silica film layer formed from a polysilazane. 2 . The ink storage member of claim 1 , wherein the intermediate layer comprises the aluminum oxide film layer, the silica film layer formed from a low molecular weight silane, or the silica film layer formed from a polysilazane on one surface or both surfaces of a paper base material. 3 . The ink storage member of claim 1 , wherein (i) the inner layer and the intermediate layer, or (ii) the intermediate layer and the outer layer are bonded to each other with an olefin-based adhesive or a silane coupling agent. 4 . The ink storage member of claim 1 , wherein at least one of the paper base material forming the inner layer and the outer layer is glassine paper. 5 - 17 . (canceled)
Assignees
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Classifications
Polymeric coating · CPC title
Inorganic coating · CPC title
on paper layer · CPC title
All layers being made of paper or paperboard · CPC title
next to another layer of paper or cardboard layer · CPC title
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Frequently asked questions
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- What does patent US2025313034A1 cover?
- An ink storage member for writing implements may reduce environmental impact by replacing the conventional aluminum with silica for the intermediate layer between the inner and the outer layer, both of which use paper as a base material, in a paper refill for writing implements. An ink storage member for writing implements may have at least three layers, including an inner layer of a paper base…
- Who is the assignee on this patent?
- Mitsubishi Pencil Co
- What technology area does this patent fall under?
- Primary CPC classification B43K7/02. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Thu Oct 09 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).