US4329262A
Expired / Lapsed
US
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Initially erasable ink composition for a ball point writing instrument
Assignee: SCRIPTO-TOKAI Corp A CORP OF
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Filing: 1981-03-25
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Granted: 1982-05-11
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Expires: 2001-03-25
Abstract
Abstract An initially erasable ink composition for a ball point writing instrument which ink is characterized by its initial erasability by ordinary pencil erasers when applied by a ball point writing instrument to an absorbent paper-like writing surface and which thereafter develops permanence. The ink composition comprises an elastomer selected from the group consisting of natural rubbers, synthetic rubbers and mixtures thereof, pigment, and a solvent system for said elastomer and pigment. The elastomer is present in the range of about 18-28% by weight of the ink and the pigment is present in the range of about 10-22% by weight of the ink. The solvent system comprises a volatile component present in the range of about 8-30% by weight of the ink and having a boiling point less than about 180° C. and an essentially non-volatile component which is predominantly a low viscosity hydrocarbon oil, essential oil, petroleum derivative, plasticizer or mixtures thereof having a boiling point less than about 300° C. and greater than about 180° C. being present in the range of about 21 to 50.5% by weight of the ink. The solvent system may also include up to 15% by weight of the ink composition of a non-volatile high viscosity material having a boiling point greater than about 300° C.
Inventors
- 👤 Frank A. Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:53
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/16; C09D11/18; Y; Y10; Y10S; Y10S260/00; Y10S260/38
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
174 words
In a ball point writing instrument containing an ink capable of depositing a trace on an absorbent, paper-like writing surface having minute voids therein, said trace being characterized by initial erasability thereof by ordinary pencil erasers and thereafter developing permanence over a period of time; said ink comprising an elastomer selected from the group consisting of natural rubbers, a synthetic rubber which essentially duplicates the chemical structure of natural rubber, and mixtures thereof, pigment, and a solvent system for said elastomer, said elastomer being present in the range of about 18-28% by weight of the ink, said pigment being present in the range of about 10-22% by weight of the ink, said solvent system comprising a volatile component present in the range of about 8-30% by weight of the ink and having a boiling point less than about 180° C. and an essentially non-volatile component being present in the range of about 21-50.5% by weight of the ink and having a boiling point less than about 300° C. and greater than about 180° C.
Claim 2
Dependent Claim
174 words
In a ball point writing instrument containing an ink capable of depositing a trace on an absorbent, paper-like writing surface having minute voids therein, said trace being characterized by initial erasability thereof by ordinary pencil erasers and thereafter developing permanence over a period of time; said ink comprising an elastomer selected from the group consisting of natural rubbers, a synthetic rubber which essentially duplicates the chemical structure of natural rubber, and mixtures thereof, pigment, and a solvent system for said elastomer, said elastomer being present in the range of about 18-28% by weight of the ink, said pigment being present in the range of about 10-22% by weight of the ink, said solvent system comprising a volatile component present in the range of about 8-30% by weight of the ink and having a boiling point less than about 180° C. and an essentially non-volatile component being present in the range of about 21-50.5% by weight of the ink and having a boiling point less than about 300° C. and greater than about 180° C.
Claim 3
Dependent Claim
37 words
In a ball point writing instrument as defined in claim 1 wherein said ink includes up to 15% by weight of the ink composition of a high viscosity material having a boiling point greater than 300° C.
Claim 4
Dependent Claim
34 words
In a ball point writing instrument as defined in claim 1 or 2 wherein said elastomer has a substantially uniform molecular weight distribution over the molecular weight range of about 100,000 to about 900,000.
Claim 5
Dependent Claim
29 words
In a ball point writing instrument as defined in claim 1 wherein said essentially non-volatile component has a viscosity within the range of about 1 to about 15 cps.
Claim 6
Dependent Claim
25 words
In a ball point writing instrument as defined in claim 2 wherein said high viscosity material has a viscosity of at least about 58 cps.
Claim 7
Dependent Claim
194 words
In a ball point writing instrument containing an ink capable of depositing a trace on an absorbent, paper-like writing surface having minute voids therein, said trace being characterized by initial erasability thereof by ordinary pencil erasers and the capability of developing permanence over a period of time, said ink comprising pigment which is present in the range of about 10-22% by weight of the ink, an elastomer, said elastomer being selected from the group consisting of natural rubbers, a synthetic rubber which essentially duplicates the chemical structure of natural rubber, and mixtures thereof, and being present in the range of about 18-28% by weight of the ink, and a solvent system therefor, said solvent system comprising a volatile component present in the range of about 8-30% by weight of the ink and an essentially non-volatile component present in the range of about 21-50.5% by weight of the ink and in which the volatile component has a boiling point less than about 180° C. and said essentially non-volatile component having a viscosity within the range of about 1 to 15 cps and a boiling point less than 300° C. and greater than about 180° C.
Claim 8
Dependent Claim
194 words
In a ball point writing instrument containing an ink capable of depositing a trace on an absorbent, paper-like writing surface having minute voids therein, said trace being characterized by initial erasability thereof by ordinary pencil erasers and the capability of developing permanence over a period of time, said ink comprising pigment which is present in the range of about 10-22% by weight of the ink, an elastomer, said elastomer being selected from the group consisting of natural rubbers, a synthetic rubber which essentially duplicates the chemical structure of natural rubber, and mixtures thereof, and being present in the range of about 18-28% by weight of the ink, and a solvent system therefor, said solvent system comprising a volatile component present in the range of about 8-30% by weight of the ink and an essentially non-volatile component present in the range of about 21-50.5% by weight of the ink and in which the volatile component has a boiling point less than about 180° C. and said essentially non-volatile component having a viscosity within the range of about 1 to 15 cps and a boiling point less than 300° C. and greater than about 180° C.
Claim 9
Dependent Claim
37 words
In a ball point writing instrument as defined in claim 6 wherein said elastomer comprises a mixture of natural rubbers and a synthetic rubber which essentially duplicates the chemical structure of natural rubber, in approximately equal amounts.
Claim 10
Dependent Claim
22 words
In a ball point writing instrument as defined in claim 1 or 6 wherein said essentially non-volatile component is a hydrocarbon oil.
Claim 11
Dependent Claim
182 words
In a ball point writing instrument containing an ink capable of depositing a trace on an absorbent, paper-like writing surface having minute voids therein, said trace being characterized by initial erasability thereof by ordinary pencil erasers and the capability of developing permanence over a period of time said ink comprising an elastomer selected from the group consisting of natural rubbers, a synthetic rubber which essentially duplicates the chemical structure of natural rubber, and mixtures thereof, said elastomer being present in amount of at least 18% by weight of the ink, pigment which is present in amount of at least 10% by weight of the ink, and a solvent system for said elastomer, said solvent system comprising a volatile component and an essentially non-volatile component, said volatile component having a boiling point less than about 180° C. and being present in an amount of at least 8% by weight of the ink, and said essentially non-volatile component having a boiling point less than 300° C. and above 180° C. and being present in an amount at least 21% by weight of the ink.
Claim 12
Dependent Claim
182 words
In a ball point writing instrument containing an ink capable of depositing a trace on an absorbent, paper-like writing surface having minute voids therein, said trace being characterized by initial erasability thereof by ordinary pencil erasers and the capability of developing permanence over a period of time said ink comprising an elastomer selected from the group consisting of natural rubbers, a synthetic rubber which essentially duplicates the chemical structure of natural rubber, and mixtures thereof, said elastomer being present in amount of at least 18% by weight of the ink, pigment which is present in amount of at least 10% by weight of the ink, and a solvent system for said elastomer, said solvent system comprising a volatile component and an essentially non-volatile component, said volatile component having a boiling point less than about 180° C. and being present in an amount of at least 8% by weight of the ink, and said essentially non-volatile component having a boiling point less than 300° C. and above 180° C. and being present in an amount at least 21% by weight of the ink.
Claim 13
Dependent Claim
22 words
In a ball point writing instrument as defined in claim 9 wherein said essentially non-volatile component is a low viscosity hydrocarbon oil.
Claim 14
Dependent Claim
28 words
In a ball point writing instrument as defined in claim 10 wherein said hydrocarbon oil has a viscosity within the range of about 1 to about 15 cps.
Claim 15
Dependent Claim
28 words
In a ball point writing instrument as defined in claim 9 wherein said volatile component is present in the range of about 8-30% by weight of the ink.
Claim 16
Dependent Claim
31 words
In a ball point writing instrument as defined in claim 9 wherein said essential non-volatile component is present in the range of about 21 to 50.5% by weight of the ink.
Claim 17
Dependent Claim
27 words
In a ball point writing instrument as defined in claim 9 wherein said pigment is present in the range of about 10-22% by weight of the ink.
Claim 18
Dependent Claim
27 words
In a ball point writing instrument as defined in claim 9 wherein said elastomer is present in the range of about 18-28% by weight of the ink.
Claim 19
Dependent Claim
32 words
In a ball point writing instrument as defined in claim 9 wherein said elastomer has a substantially uniform molecular weight distribution over the molecular weight range of about 100,000 to about 900,000.
Claim 20
Dependent Claim
40 words
In a ball point writing instrument as defined in claim 9 wherein said solvent system further comprises up to 15% by weight of the ink composition of a non-volatile high viscosity material having a boiling point greater than 300° C.
Claim 21
Dependent Claim
26 words
In a ball point writing instrument as defined in claim 17 wherein said non-volatile high viscosity material has a viscosity of at least about 58 cps.
Claim 22
Dependent Claim
37 words
In a ball point writing instrument as defined in claim 9 wherein said elastomer comprises a mixture of natural rubbers and a synthetic rubber which essentially duplicates the chemical structure of natural rubber in approximately equal amounts.
Claim 23
Dependent Claim
22 words
In a ball point writing instrument as defined in claim 9 wherein said essentially non-volatile component is a low viscosity essential oil.
Claim 24
Dependent Claim
22 words
In a ball point writing instrument as defined in claim 9 wherein said essentially non-volatile component is a low viscosity petroleum derivative.
Claim 25
Dependent Claim
21 words
In a ball point writing instrument as defined in claim 9 wherein said essentially non-volatile component is a low viscosity plasticizer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-10 | 1985-11-09 | 1986-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-10 | 1989-11-09 | 1990-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-10 | 1993-11-09 | 1994-05-11 | $7700.00 | Window Closed / Lapsed |