US4913783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of a perforated nickel frame by electroforming
Assignee: Fingraf AG
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Filing: 1989-05-01
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Granted: 1990-04-03
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Expires: 2009-05-01
Abstract
Abstract The present invention relates to the production by electroforming of perforated frames used especially to form flat or cylindrical printing frames. According to the invention, the procedure is in two stages, with two separate electrochemical baths, the second bath comprising a pyridinium compound of general formula: ##STR1## in which: R is an optionally substituted alkyl chain, R' is a hydrogen atom or a substituent group in any position relative to the nitrogen atom of the pyridinium nucleus.
Inventors
- 👤 Armand Piolat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:29
CPC Classifications
C; C25; C25D; C25D1/00; C25D1/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
164 words
A process for the manufacture by electroforming of a perforated nickel frame, according to which the operation is carried out in at least two stages: (a) according to a first stage, and in a first electrolytic bath, a first deposit of nickel is produced on an engraved support mandrel comprising alveoli whose opening is closed by a nonconductive substance, and whose edge or ridge is conductive, and a nickel skeleton is separated from the mandrel, its perforations corresponding substantially to the alveoli of the said mandrel, (b) according to a second stage, and in a second electrolytic bath, a second deposit of nickel is produced on the skeleton, characterized in that at least the second bath has added to it a pyridinium compound of formula: ##STR3## in which: R is a saturated alkyl chain containing at least one carbon atom and optionally substituted, R' is a hydrogen atom or a substituent group in any position relative to the nitrogen atom of the pyridinium nucleus.
Claim 2
Dependent Claim
164 words
A process for the manufacture by electroforming of a perforated nickel frame, according to which the operation is carried out in at least two stages: (a) according to a first stage, and in a first electrolytic bath, a first deposit of nickel is produced on an engraved support mandrel comprising alveoli whose opening is closed by a nonconductive substance, and whose edge or ridge is conductive, and a nickel skeleton is separated from the mandrel, its perforations corresponding substantially to the alveoli of the said mandrel, (b) according to a second stage, and in a second electrolytic bath, a second deposit of nickel is produced on the skeleton, characterized in that at least the second bath has added to it a pyridinium compound of formula: ##STR3## in which: R is a saturated alkyl chain containing at least one carbon atom and optionally substituted, R' is a hydrogen atom or a substituent group in any position relative to the nitrogen atom of the pyridinium nucleus.
Claim 3
Dependent Claim
30 words
A process according to claim 1, characterized in that R is an alkyl chain substituted by at least one group containing no double or triple bond with a carbon atom.
Claim 4
Dependent Claim
24 words
A process according to claim 1, characterized in that R' is a substituent group containing no double or triple bond with a carbon atom.
Claim 5
Dependent Claim
24 words
A process according to claim 1, characterized in that the pyridinium compound is sulfopropylated and R is an alkyl chain containing three carbon atoms.
Claim 6
Dependent Claim
26 words
A process according to claim 2, characterized in that the alkyl chain is substituted by a hydroxyl group in position 2 relative to the pyridinium nucleus.
Claim 7
Dependent Claim
28 words
A process according to claim 3, characterized in that the pyridinium nucleus is substituted by at least one group chosen from the following groups, namely methyl and benzyl.
Claim 8
Dependent Claim
29 words
A process according to claim 1, characterized in that the pyridinium compound is employed in the second bath in a proportion of 60 to 250 g per 10,000 A/h.
Claim 9
Dependent Claim
27 words
A process according to claim 1, characterized in that the second bath is circulated parallel to the anode at a velocity of between 5 and 20 cm/second.
Claim 10
Dependent Claim
22 words
A process according to claim 1, characterized in that the pyridinium compound is employed in the second bath with a voltage-reducer compound.
References Cited (Backward Citations)
US2226384A
Cited
GB2051130A
Cited
EP0038104A1
Cited
EP0049022A1
Cited
US4397715A
Cited
US4430171A
Cited
EP0079642A1
Cited
US4430170A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-02 | 1993-10-02 | 1994-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-02 | 1997-10-02 | 1998-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-02 | 2001-10-02 | 2002-04-03 | $7700.00 | Window Closed / Lapsed |