US4228028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ball point pen, ink, and its eradicator system
Assignee: Nu Kote International Inc
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Filing: 1978-11-13
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Granted: 1980-10-14
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Expires: 1998-11-13
Abstract
Abstract Disclosed is a ball point ink pen, its ink and its eradicator. The ink is carried at one end of the pen and the eradicator portion is carried at the other. If an error is made, the pen can be reversed and the eradicator used to neutralize the ink. The ink also neutralizes the eradicator so that when one rewrites with the same ink, any remaining eradicator on the paper is neutralized and the original ink acts as fresh ink.
Inventors
- 👤 An-Chung R. Lin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:22
CPC Classifications
B; B43; B43L; B43L19/00; B43L19/0018; B43K; B43K27/00; B43K29/00; B43K29/05; C; C09; C09D; C09D11/00; C09D11/16; C09D11/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
An eradicator for dye based ink which remains colored in acid solution consisting of: an amount of a hydroxide base effective to neutralize the acid of said ink, an amount of an amine which amine is selected from the group comprising butyl amine, 3-methoxy propylamine, triethylene tetramine, ethanol amine, morpholine, benzyl amine or other aliphatic-like primary amines, effective to act as a decolorizing agent for the dye to form a colorless product, and a hydroxy solvent.
Claim 2
Dependent Claim
76 words
An eradicator for dye based ink which remains colored in acid solution consisting of: an amount of a hydroxide base effective to neutralize the acid of said ink, an amount of an amine which amine is selected from the group comprising butyl amine, 3-methoxy propylamine, triethylene tetramine, ethanol amine, morpholine, benzyl amine or other aliphatic-like primary amines, effective to act as a decolorizing agent for the dye to form a colorless product, and a hydroxy solvent.
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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) | 1983-10-14 | 1984-04-14 | 1984-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-14 | 1988-04-14 | 1988-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-14 | 1992-04-14 | 1992-10-14 | $7700.00 | Window Closed / Lapsed |