US4419464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Erasable ink for ball point pens
Assignee: Individual
•
Filing: 1982-07-29
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Granted: 1983-12-06
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Expires: 2002-07-29
Abstract
Abstract An erasable ink for use in a ball point pen, particularly in a pressurized cartridge, is a fluid comprising at least 10% w of polyvinyl acetate or a copolymer of ethylene and vinyl acetate, and at least 10% w trichloroethylene. The ink preferably also contains at least 5% w of a solvent boiling in the range of 180°-250° C., a plasticizer boiling above 270° C., a colorant, and a tackifier.
Inventors
- 👤 Raymond S. Williams
- 👤 Paul C. Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:46
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/16; C09D11/18
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
56 words
An erasable writing ink suitable for use in a ball point pen comprising at least 10% by weight of an elastomer selected from the group consisting of polyvinyl acetate, a copolymer of ethylene and vinyl acetate, and mixtures thereof, from about 10% to about 40% by weight of trichloroethylene, and an effective amount of a colorant.
Claim 2
Dependent Claim
56 words
An erasable writing ink suitable for use in a ball point pen comprising at least 10% by weight of an elastomer selected from the group consisting of polyvinyl acetate, a copolymer of ethylene and vinyl acetate, and mixtures thereof, from about 10% to about 40% by weight of trichloroethylene, and an effective amount of a colorant.
Claim 3
Dependent Claim
17 words
The ink of claim 1 which contains from about 10% to about 25% by weight of elastomer.
Claim 4
Dependent Claim
23 words
The ink of claim 1 also comprising at least 5%w of a solvent having a boiling point of at least about 180° C.
Claim 5
Dependent Claim
27 words
The ink of claims 1 or 3 also comprising at least about 5%w of a second solvent having a boiling point of at least about 270° C.
Claim 6
Dependent Claim
14 words
The ink of claim 3 wherein the solvent is benzyl alcohol or dipropylene glycol.
Claim 7
Dependent Claim
16 words
The ink of claim 4 wherein the second solvent is a polyester plasticizer or toluene sulfonamide.
Claim 8
Dependent Claim
24 words
The ink of claim 1 also comprising from 0-25%w of a white mineral oil having an initial boiling point of at least 270° C.
Claim 9
Dependent Claim
60 words
The ink of claim 1 comprising from about 10% to about 25%w elastomer, about 10% to about 40%w trichloroethylene, about 5% to about 32%w of a solvent boiling in the range of about 180°-250° C., about 0% to about 25%w of a solvent having a boiling point of at least 270° C., and at least about 10%w of a colorant.
Claim 10
Dependent Claim
15 words
The ink of claim 8 also comprising at least about 3%w of a tackifying agent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |