Patent US4239832A successfully refreshed from Google Patents.
US4239832A
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Adhesively correctable transfer medium with delayed alteration resistance characteristics
Assignee: Eaton Allen Corp
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Filing: 1978-11-30
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Granted: 1980-12-16
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Expires: 1998-11-30
Abstract
Abstract The present invention relates to an ink formulation which may be coated on a flexible substratum to produce a typewriter ribbon or the like, wherein impressions made from such a ribbon are capable of adhesive removal shortly after being created on all conventional typing bonds and papers, but which impressions exhibit delayed alteration resistance whereby any attempt at correcting or removing the indicia by pressure sensitive adhesive means or altering the indicia by erasing will leave an obvious and permanent indication that a removal was attempted.
Inventors
- 👤 Victor Barouh
- 👤 George Rottmann
- 👤 Salvatore DeSimone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:40
CPC Classifications
B; B41; B41J; B41J29/00; B41J29/26; Y; Y10; Y10S; Y10S428/00; Y10S428/914; Y10S428/915; Y10S428/916; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31826; Y10T428/31855; Y10T428/31931
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
81 words
In a typewriter ribbon having a thin flexible substratum and an image yielding transfer layer capable of producing indicia which, in connection with typing bond, are initially adhesively removable and exhibit a delayed alteration resistance, wherein the improvement comprises said transfer layer including a water soluble salt which reacts with paper, said water soluble salt being selected from the group consisting of cupric chloride, ammonium acetate, calcium thoicyanate, potassium acetate, barium chloride, potassium permanganate, lithium acetate, iodine trichloride and strontium hydroxide.
Claim 2
Dependent Claim
81 words
In a typewriter ribbon having a thin flexible substratum and an image yielding transfer layer capable of producing indicia which, in connection with typing bond, are initially adhesively removable and exhibit a delayed alteration resistance, wherein the improvement comprises said transfer layer including a water soluble salt which reacts with paper, said water soluble salt being selected from the group consisting of cupric chloride, ammonium acetate, calcium thoicyanate, potassium acetate, barium chloride, potassium permanganate, lithium acetate, iodine trichloride and strontium hydroxide.
Claim 3
Dependent Claim
27 words
A typewriter ribbon as in claim 1, wherein the content of the water soluble salt is between 0.2 to 12% by weight of the total ink formulation.
Claim 4
Dependent Claim
75 words
In a typewriter ribbon having a thin flexible substratum and an image yielding transfer layer capable of producing indicia which, in combination with typing bond, are initially adhesively removable and exhibit a delayed alteration resistance, wherein the improvement comprises said transfer layer including an organic acid which reacts with paper, said organic acid being selected from a group consisting of bromo acetic acid, monochloro acetic acid, acetic acid, citric acid, tartaric acid and oxalic acid.
Claim 5
Dependent Claim
75 words
In a typewriter ribbon having a thin flexible substratum and an image yielding transfer layer capable of producing indicia which, in combination with typing bond, are initially adhesively removable and exhibit a delayed alteration resistance, wherein the improvement comprises said transfer layer including an organic acid which reacts with paper, said organic acid being selected from a group consisting of bromo acetic acid, monochloro acetic acid, acetic acid, citric acid, tartaric acid and oxalic acid.
Claim 6
Dependent Claim
26 words
A typewriter ribbon as in claim 3, wherein the content of the organic acid is between 0.2 to 12% by weight of the total ink formulation.
References Cited (Backward Citations)
US1083007A
Cited
US2338042A
Cited
US2382861A
Cited
GB819319A
Cited
GB934356A
Cited
US3105769A
Cited
FR1373770A
Cited
US3460964A
Cited
US3363336A
Cited
US3363337A
Cited
US3847850A
Cited
US4092280A
Cited
US4161551A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |