US4367966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Erasable ink for ball point pens comprising trifluoroethylene and vinyl acetate polymers
Assignee: Individual
•
Filing: 1981-11-12
•
Granted: 1983-01-11
•
Expires: 2001-11-12
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
2026-10-26 18:28
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/16; C09D11/18
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
88 words
In combination, a ball point writing instrument containing an ink capable of depositing a visible trace by writing with its ball on paper, said ink comprising at least 10% by weight of an elastomer selected from the group consisting of polyvinyl acetate homopolymer since polyvinylacetate is generic to ethylene and vinyl acetate copolymer and applicant has support for the term by generic term-Vinac-generic Trade Name term and intented polymer, a copolymer of ethylene and vinyl acetate and mixtures thereof, and at least about 10% by weight of trichloroethylene.
Claim 2
Dependent Claim
88 words
In combination, a ball point writing instrument containing an ink capable of depositing a visible trace by writing with its ball on paper, said ink comprising at least 10% by weight of an elastomer selected from the group consisting of polyvinyl acetate homopolymer since polyvinylacetate is generic to ethylene and vinyl acetate copolymer and applicant has support for the term by generic term-Vinac-generic Trade Name term and intented polymer, a copolymer of ethylene and vinyl acetate and mixtures thereof, and at least about 10% by weight of trichloroethylene.
Claim 3
Dependent Claim
14 words
The combination of claim 1 wherein the ink is contained in a pressurized cartridge.
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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) | 1986-01-10 | 1986-07-12 | 1987-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-10 | 1990-07-12 | 1991-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-10 | 1994-07-12 | 1995-01-11 | $7700.00 | Window Closed / Lapsed |