US3664869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Typewriter ribbons having correction coating and method of making
Assignee: Individual
•
Filing: 1969-01-23
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Granted: 1972-05-23
•
Expires: 1989-01-23
Abstract
Abstract The invention provides typewriting ribbons which comprise on a single, homogeneous support consisting of a synthetic polymer film a writing, inked part and a part suitable for correcting typing mistakes coated with a white, hiding composition. The support, preferably made of a polyester resin or of polypropylene, is preferably coated with a thin layer essentially consisting of a vinylidenic polymer. The hiding composition for correction contains essentially 75-98 percent b.w. of a pigment which is titanium bioxide having an oil index of between 30 and 60, 0.5-10 percent b.w. of a binder which is a rubber-like resin having a molecular weight over 2,000 and soluble in organic solvents, little percentages of a wetting agent.
Inventors
- 👤 Sergio Sala
- 👤 Ambrogio Cuneo
- 👤 Wolfgang Dabisch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:24
CPC Classifications
B; B41; B41J; B41J31/00; B41J31/05; B41J31/09; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
20 words
A typewriting ribbon, as set forth in claim 1, wherein said undercoat of vinylidenic polymer consists essentially of polyvinylidene chloride.
Claim 2
Dependent Claim
28 words
A typewriting ribbon, as set forth in claim 1, wherein said correcting composition comprises 0.5-10 percent, by weight, of at least one hard resin soluble in organic solvents.
Claim 3
Dependent Claim
17 words
A typewriting ribbon, as set forth in claim 3, wherein said hard resin is a cellulose derivative.
Claim 4
Dependent Claim
31 words
A typewriting ribbon, as set forth in claim 1, wherein said wetTing agent in said correcting composition consists of one of lecithin and a fatty acid of a high molecular weight.
Claim 5
Dependent Claim
43 words
A typewriting ribbon, as set forth in claim 1, wherein said correcting composition comprises about 1-10 percent, by weight, of one of a hard wax, a hard paraffin, and a hard polyvalent soap, which are at most only partly soluble in organic solvents.
Claim 6
Dependent Claim
30 words
A typewriting ribbon, as set forth in claim 1, wherein said correcting composition comprises about 5 percent by weight, of polyisobutylene having an average molecular weight of about 3, 000.
Claim 7
Dependent Claim
23 words
A typewriting ribbon, as set forth in claim 1, wherein said correcting composition comprises a derivative of montmorillonite acting as an absorbent medium.
Claim 8
Dependent Claim
21 words
A typewriting ribbon, as set forth in claim 1, wherein said correcting composition comprises about 1-10 percent by weight of microtalcum.
Claim 9
Dependent Claim
24 words
A typewriting ribbon, as set forth in claim 1, wherein said support member is formed of a sheet of one of polyester and polypropylene.
Claim 10
Dependent Claim
113 words
A process for manufacturing typewriter ribbons used for typing ink characters and for correcting typing errors by applying a covering composition, comprising covering the transverse surface of a synthetic polymer film support member with an undercoat of a vinylidenic polymer, drying the undercoat, applying a coating of ink to a portion of the transverse undercoated surface of the support member in at least one longitudinally extending strip leaving the remainder of the transverse surface uncoated, drying the ink coating, coating the remainder of the transverse surface of the support member with a typing error covering composition containing titanium bioxide pigments having an oil index between 30 and 60, and drying the covering composition.
Claim 11
Dependent Claim
44 words
A process, as set forth in claim 11, wherein using a 10-15 percent suspension in acetone of 98.9 parts of polyvinylidene chloride and the balance to form 100 parts consisting of small percentages of a plasticizer and of a stabilizer for forming the undercoat.
Claim 12
Dependent Claim
34 words
A process, as set forth in claim 11, wherein using a self-regenerative ink for coating the undercoated support member with the ink in the form of a suspension in one of acetone and methyl-ethyl-ketone.
Claim 13
Dependent Claim
85 words
A process, as set forth in claim 13, wherein using as the correcting composition a substance comprising as a pigment 75-98 percent, by weight of titanium bioxide, as a binder about 1.5-10 percent by weight of at least one rubber-like resin having a molecular weight over 2,000 and being substantially completely soluble in organic solvents, and a wetting agent of about 0.5-2 percent by weight, and regulating the thickness of the coating of the correcting composition whereby it corresponds to about 10-15g/m2 of dry substance.
Claim 14
Dependent Claim
26 words
A process, as set forth in claim 14, wherein the correcting composition comprises about 0.5-10 percent, by weight of a hard resin soluble in organic solvents.
Claim 15
Dependent Claim
16 words
A process, as set forth in claim 15, wherein the hard resin is a cellulose derivative.
Claim 16
Dependent Claim
30 words
A process, as set forth in claim 15, wherein the wetting agent in the correcting composition consists of one of lecithin and a fatty acid having a high molecular weight.
Claim 17
Dependent Claim
42 words
A process, as set forth in claim 15, wherein the correcting composition comprises about 1-10 percent by weight of one of a hard wax, a hard paraffin, and a polyvalent metallic salt which are at most only partly soluble in organic solvents.
Claim 18
Dependent Claim
30 words
A process, as set forth in claim 15, wherein the correcting composition comprises about 5 percent by weight of a polyisobutylene having an average molecular weight of about 3, 000.
Claim 19
Dependent Claim
22 words
A process, as set forth in claim 15, wherein the correcting composition comprises a derivative of montmorillonite acting as an absorbent medium.
Claim 20
Dependent Claim
20 words
A process, as set forth in claim 15, wherein said correcting composition comprises about 5-10 percent by weight of microtalcum.
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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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |