US4437935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for providing security features in paper
Assignee: Crane and Co Inc
•
Filing: 1981-06-03
•
Granted: 1984-03-20
•
Expires: 2001-06-03
Abstract
Abstract A security device is integrally combined with the fibres of the paper in a paper-making process. A carrier web of water-dispersible fibres carrying the security element is brought into contact with the paper stock during the paper-making process. The carrier web becomes rapidly dispersed upon contact with the wet stock leaving the security element firmly attached to the paper fibres in the stock. In one embodiment, the security element comprises a plastic diffraction grating structure. In a further embodiment, the carrier web comprises an open porous structure for enhancing intermixing with the paper stock.
Inventors
- 👤 Frederick G. Crane, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:15
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/40; D21H21/42
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
106 words
A method for producing identifiable paper during the paper forming process on a paper making machine comprising the steps of: attatching a security device consisting of a plastic film diffraction grating to one surface of a carrier web of water-dispersible paper; positioning the carrier paper and security device relative to a predetermined position on a base paper web of less porous web density than said carrier web during the deposition and dewatering of said base paper web from a water suspension of said base paper fibers; and dispersing the carrier paper web to integrally join the security device to said one surface of the base paper.
Claim 2
Independent Claim
106 words
A method for producing identifiable paper during the paper forming process on a paper making machine comprising the steps of: attatching a security device consisting of a plastic film diffraction grating to one surface of a carrier web of water-dispersible paper; positioning the carrier paper and security device relative to a predetermined position on a base paper web of less porous web density than said carrier web during the deposition and dewatering of said base paper web from a water suspension of said base paper fibers; and dispersing the carrier paper web to integrally join the security device to said one surface of the base paper.
Claim 3
Independent Claim
127 words
A method of producing identifiable paper comprising the steps of: depositing and dewatering a continuous web of base paper fibres from a water suspension of said base paper fibers; providing a carrier paper web consisting of a plurality of water dispersible paper fibres having at least one security device consisting of a plurality of plastic or metal fibres having a hydrophobic coating on one surface to prevent the carrier web from adhering to said one surface; inserting said carrier paper web relative to a predetermined position on said base paper web during the deposition and dewatering of said base paper web to disperse said carrier fibres and to cause said base paper fibres to integrally attatch said security device on said one surface of said base paper.
Claim 4
Independent Claim
127 words
A method of producing identifiable paper comprising the steps of: depositing and dewatering a continuous web of base paper fibres from a water suspension of said base paper fibers; providing a carrier paper web consisting of a plurality of water dispersible paper fibres having at least one security device consisting of a plurality of plastic or metal fibres having a hydrophobic coating on one surface to prevent the carrier web from adhering to said one surface; inserting said carrier paper web relative to a predetermined position on said base paper web during the deposition and dewatering of said base paper web to disperse said carrier fibres and to cause said base paper fibres to integrally attatch said security device on said one surface of said base paper.
References Cited (Backward Citations)
US2017339A
Cited
US2143406A
Cited
US3691009A
Cited
GB1365876A
Cited
US3880706A
Cited
US3853695A
Cited
US3892622A
Cited
US4250217A
Cited
US4304809A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |