Patent US4629630A successfully refreshed from Google Patents.
US4629630A
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Check paper that is protected against forgery and tampering
Assignee: GAO Gesellschaft fuer Automation und Organisation mbH
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Filing: 1984-04-30
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Granted: 1986-12-16
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Expires: 2004-04-30
Abstract
Abstract A check paper is being described which is protected against falsifications and forgeries. Crushable micro capsules are being embedded in check paper which contain on one hand a leuco ink and on the other hand a color acceptor. The color acceptor can also be stored in the body of the paper without the use of micro capsules. The leuco ink and the color acceptor react together under color development or color changes if the micro capsules burst through imprinting or other local pressure application to the paper surface. Thus, a character written on the paper surface becomes visible within the body of the paper and cannot be forged anymore.
Inventors
- 👤 Ludwig Devrient
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:07
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/40; D21H21/44; D21H21/46; Y; Y10; Y10S; Y10S428/00; Y10S428/916; Y10S462/00; Y10S462/903; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24835; Y10T428/24851; Y10T428/31504; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
104 words
A method, for producing check paper which is resistant to tampering or forgery comprising the steps of: producing a first web of paper pulp and producing a second web of paper pulp utilizing a double-sieve paper machine and adding micro encapsulated leuco ink and color acceptor to the paper prior to joining said webs, forming a sheet of paper from the paper material of the first and second webs of the double-sieve machine by joining said first and second webs such that the micro encapsulated leuco ink and the color acceptor are present together only in a region of interface of the two webs.
Claim 2
Independent Claim
104 words
A method, for producing check paper which is resistant to tampering or forgery comprising the steps of: producing a first web of paper pulp and producing a second web of paper pulp utilizing a double-sieve paper machine and adding micro encapsulated leuco ink and color acceptor to the paper prior to joining said webs, forming a sheet of paper from the paper material of the first and second webs of the double-sieve machine by joining said first and second webs such that the micro encapsulated leuco ink and the color acceptor are present together only in a region of interface of the two webs.
Claim 3
Dependent Claim
37 words
Method for the production of a check paper on a double-sieve machine according to claim 1, wherein the step of adding the leuco ink includes adding leuco ink between the two webs before uniting the two webs.
Claim 4
Dependent Claim
22 words
Method according to claim 2, wherein the step of adding the leuco ink includes spraying by means of jets between the webs.
Claim 5
Dependent Claim
16 words
Method according to claim 3, wherein the leuco ink is sprayed while suspended in a liquid.
Claim 6
Dependent Claim
23 words
Method according to claim 1, wherein the leuco ink is applied by means of jets in the form of designs or curved lines.
Claim 7
Dependent Claim
51 words
The method for the production of check paper according to claim 1, wherein the step of adding the color acceptor and the leuco ink comprises adding the color acceptor throughout the material of one of said webs and adding said leuco ink throughout the material of the other of said webs.
Claim 8
Dependent Claim
18 words
The method for the production of check paper according to claim 1, wherein the color acceptor is micro-encapsulated.
Claim 9
Dependent Claim
34 words
The method for the production of check paper according to claim 1, wherein the step of adding the color acceptor includes adding the color acceptor between the two webs before uniting the two webs.
Claim 10
Dependent Claim
29 words
The method for the production of check paper according to claim 8, wherein the step of adding the color acceptor includes spraying by means of jets betwen the webs.
Claim 11
Dependent Claim
23 words
The method for the production of check paper according to claim 9, wherein the color acceptor is sprayed while suspended in a liquid.
Claim 12
Dependent Claim
25 words
The method for production of check paper according to claim 10, wherein the color acceptor is applied in the form of designs or curved lines.
Claim 13
Dependent Claim
59 words
The method of claim 1 or 7, wherein either one of the leuco ink or the color acceptor is added by introducing said one throughout the material of one web on the double-sieve paper machine and the other one of the leuco ink or the color acceptor is added by applying said other one between the webs by spraying.
Claim 14
Dependent Claim
14 words
The method of claim 12, wherein said spraying step is by means of jets.
Claim 15
Dependent Claim
23 words
The method of claim 13, wherein the one of the leuco ink or the color acceptor is sprayed while suspended in a liquid.
Claim 16
Dependent Claim
17 words
The method of claim 14, wherein the spraying is in the form of designs or curved lines.
Claim 17
Dependent Claim
43 words
The method for the prodouction of check paper according to claim 1, wherein the step of adding both the color acceptor and the micro-encapsulated leuco ink includes adding said color acceptor and leuco ink between the two webs before uniting the two webs.
Claim 18
Independent Claim
69 words
A method, for producing check paper which is resistant to tampering or forgery comprising the steps of: adding micro-encapsulated leuco ink to paper pulp associated with one web of a double-sieve paper machine; adding color acceptor to paper pulp associated with a second web of a double-sieve paper machine; and forming a sheet of paper from the paper pulp of the first and second webs of the double-sieve machine.
Claim 19
Independent Claim
69 words
A method, for producing check paper which is resistant to tampering or forgery comprising the steps of: adding micro-encapsulated leuco ink to paper pulp associated with one web of a double-sieve paper machine; adding color acceptor to paper pulp associated with a second web of a double-sieve paper machine; and forming a sheet of paper from the paper pulp of the first and second webs of the double-sieve machine.
Claim 20
Dependent Claim
17 words
A method according to claim 1 including the step of forming said webs from fibrous paper pulp.
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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) | 1989-12-15 | 1990-06-16 | 1990-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-15 | 1994-06-16 | 1994-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-15 | 1998-06-16 | 1998-12-16 | $7700.00 | Window Closed / Lapsed |