US5993098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous gel ink-filled ball point pen
Assignee: Mitsubishi Pencil Co Ltd
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Filing: 1997-12-12
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Granted: 1999-11-30
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Expires: 2017-12-12
Abstract
Abstract Provided is an aqueous gel ink-filled ball point pen having less blobbing and capable of drawing stable lines having vivid color and no uneven written intensity. The aqueous gel ink-filled ball point pen has a ball of a diameter of 0.3 to 2.0 mm at a tip point with an aqueous gel ink having a viscosity ratio (a value of (viscosity at 10 rpm)/(viscosity at 50 rpm) measured by means of an E type rotational viscometer) of 1.1 to 4.0 and controlled an ink lay down value according to JIS Standard S6053 to 50 to 200 mg/m.
Inventors
- 👤 Takahiro Osada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:46
CPC Classifications
B; B43; B43K; B43K7/00; B43K7/01
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
82 words
An aqueous gel ink-filled ball point pen in which the ball point pen having a ball with a diameter of 0.3 to 2.0 mm at a tip point thereof is charged with an aqueous gel ink having a viscosity ratio (a value of (viscosity at 10 rpm)/(viscosity at 50 rpm) measured by means of an E type rotational viscometer) of 1.1 to 4.0 and an ink lay down value according to JIS Standard S6053 is controlled to 50 to 200 mg/100 m.
Claim 2
Dependent Claim
82 words
An aqueous gel ink-filled ball point pen in which the ball point pen having a ball with a diameter of 0.3 to 2.0 mm at a tip point thereof is charged with an aqueous gel ink having a viscosity ratio (a value of (viscosity at 10 rpm)/(viscosity at 50 rpm) measured by means of an E type rotational viscometer) of 1.1 to 4.0 and an ink lay down value according to JIS Standard S6053 is controlled to 50 to 200 mg/100 m.
Claim 3
Dependent Claim
33 words
The aqueous gel ink-filled ball point pen charged with an aqueous gel ink as claimed in claim 1, wherein said aqueous gel ink comprises an aqueous medium comprising a water soluble organic solvent.
Claim 4
Dependent Claim
43 words
The aqueous gel ink-filled ball point pen charged with an aqueous gel ink as claimed in claim 2, wherein said water soluble organic solvent comprises a compound selected from the group consisting of alkylene glycols, polyalkylene glycols, triols, glycerols, thiodiethanol, N-methyl-2-pyrrolidone and 1,3-dimethyl-2-imidazolidinone.
Claim 5
Dependent Claim
27 words
The aqueous gel ink-filled ball point pen charged with an aqueous gel ink as claimed in claim 3, wherein the water soluble organic solvent comprises propylene glycol.
Claim 6
Dependent Claim
65 words
The aqueous gel ink-filled ball point pen charged with an aqueous gel ink as claimed in claim 1, said aqueous gel ink further comprising a pseudo-plasticizer selected from natural resins consisting of xanthan gum, tamarind gum, carrageenan gum, tragacanth gum, locust bean gum, gum arabic, guar gum, curdlan, pectin, agar, gelatin, mannans, and cellulose, and from acrylic synthetic polymers, urethane synthetic polymers, smectite, and montmorillonite.
Claim 7
Dependent Claim
37 words
The aqueous gel ink-filled ball point pen charged with an aqueous gel ink as claimed in claim 5, wherein said pseudo-plasticizer is a cellulose selected from the group consisting of methyl cellulose, ethyl cellulose and carboxymethyl cellulose.
Claim 8
Dependent Claim
23 words
The aqueous gel ink-filled ball point pen charged with an aqueous gel ink as claimed in claim 6, wherein said cellulose is carboxymethylcellulose.
Claim 9
Dependent Claim
33 words
The aqueous gel ink-filled ball point pen charged with an aqueous gel ink as claimed in claim 5, wherein said resins are selected from the group consisting of carboxymethyl cellulose and xanthan gum.
References Cited (Backward Citations)
US3533708A
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US5150979A
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US4384800A
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US4349639A
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US4653950A
Cited
US4973180A
Cited
US5609432A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-11-29 | 2003-05-31 | 2003-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-11-29 | 2007-05-31 | 2007-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-11-29 | 2011-05-31 | 2011-11-30 | $7700.00 | Window Closed / Lapsed |