US4227930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ball point pen, ink, and its eradicator system
Assignee: Nu Kote International Inc
•
Filing: 1978-11-13
•
Granted: 1980-10-14
•
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
2026-10-24 13:41
CPC Classifications
G; G09; G09B; G09B3/00; G09B3/02; G09B3/04; B; B43; B43K; B43K29/00; B43K29/05; B43L; B43L19/00; B43L19/0018; C; C09; C09D; C09D11/00; C09D11/16; C09D11/18; C09D11/50
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
38 words
A colored ink which can be eradicated after application, consisting of: a dye which remains colored in acid solution, a vehicle solution in which the dye will dissolve, and an acid with a PKa value smaller than 7.
Claim 2
Dependent Claim
38 words
A colored ink which can be eradicated after application, consisting of: a dye which remains colored in acid solution, a vehicle solution in which the dye will dissolve, and an acid with a PKa value smaller than 7.
Claim 3
Dependent Claim
47 words
An ink according to claim 1 wherein the acid is selected from a group consisting of citric acid, lactic acid, oxalic acid, acetic acid, benzoic acid, phthalic acid, Malonic acid, Succinic acid, Glutaric acid and other aliphatic, aromatic or inorganic acids having a PKa value below 7.
Claim 4
Dependent Claim
37 words
An ink according to claim 1 wherein the dye is chosen from a group of dyes which react with amines to form colorless products, said group comprising diphenyl methane and triphenyl methane dyes and alkali blue dye.
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) | 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 |