US2678299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making planographic printing plates
Assignee: Printing Developments Inc
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Filing: 1950-07-18
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Granted: 1954-05-11
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Expires: 1970-07-18
Abstract
No abstract record available.
Inventors
- 👤 Geese Charles Frederick
- 👤 Lytle Donald Bruce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:03
CPC Classifications
B; B41; B41N; B41N1/00; B41N1/04; B41N1/08; B41N1/10; B41N3/00; B41N3/08; C; C25; C25D; C25D3/00; C25D3/02; C25D3/04; C25D3/06; C25D7/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
241 words
A METHOD OF DEPOSITING A WATER-RECEPTIVE CHROMIUM SURFACE LAYER FOR A BIMETALLIC PLANOGRAPHIC PRINTING PLATE, COMPRISING IMMERSING A PLATE HAVING A SMOOTH, UNGRAINED METAL SURFACE IN A CHROMIUM PLATING BATH CONTAINING CHROMIUM TRIOXIDE AND SULFATE IONS IN A RATIO OF ABOUT 100 TO 1, PASSING ELECTRIC CURRENT BETWEEN AN ANODE AND THE PLATE AS A CATHODE,AT A SELECTED CURRENT DENSITY BETWEEN ABOUT 3/4 AMPERE AND 10 AMPERE PER SQUARE INCH FOR A PERIOD OF ABOUT 1 TO 3 MINUTES, INTERRUPTING THE CURRENT FOR A PERIOD OF ABOUT 15 TO 60 SECONDS, AGAIN PASSING THE CURRENT BETWEEN THE ANODE AND THE PLATE FOR AN ADDITIONAL PERIOD OF 20 TO 60 SECOND, TO DEPOSIT A LAYER OF DULL, FINE-GRAINED CHROMIUM ON SAID UNGAINED SURFACE, THE TEMPERATURE OF THE BATH BEING MAINTAINED, AT SAID SELECTED CURRENT DENSITY PER SQUARE INCH, WITHIN THE RANGE DEFINED BY THE FOLLOWING LIMITS: 95* F. TO 97.5* F. AT 0.75 AMPERE(S) 95* F. TO 102.0* F. AT 1.0 AMPERE(S) 95* F. TO 112.5* F. AT 1.5 AMPERE(S) 95* F. TO 122.0* F. AT 2.0 AMPERE(S) 102* F. TO 129.0* F. AT 3.0 AMPERE(S) 109* F. TO 130.0* F. AT 4.0 AMPERE(S) 117* F. TO 131.0* F. AT 5.0 AMPERE(S) 118* F. TO 132.0* F. AT 6.0 AMPERE(S) 119* F. TO 133.0* F. AT 7.0 AMPERE(S) 120* F. TO 133.5* F. AT 8.0 AMPERE(S) 121* F. TO 134.5* F. AT 9.0 AMPERE(S) 122* F. TO 135.5* F. AT 10.0 AMPERE(S)
Claim 2
Independent Claim
241 words
A METHOD OF DEPOSITING A WATER-RECEPTIVE CHROMIUM SURFACE LAYER FOR A BIMETALLIC PLANOGRAPHIC PRINTING PLATE, COMPRISING IMMERSING A PLATE HAVING A SMOOTH, UNGRAINED METAL SURFACE IN A CHROMIUM PLATING BATH CONTAINING CHROMIUM TRIOXIDE AND SULFATE IONS IN A RATIO OF ABOUT 100 TO 1, PASSING ELECTRIC CURRENT BETWEEN AN ANODE AND THE PLATE AS A CATHODE,AT A SELECTED CURRENT DENSITY BETWEEN ABOUT 3/4 AMPERE AND 10 AMPERE PER SQUARE INCH FOR A PERIOD OF ABOUT 1 TO 3 MINUTES, INTERRUPTING THE CURRENT FOR A PERIOD OF ABOUT 15 TO 60 SECONDS, AGAIN PASSING THE CURRENT BETWEEN THE ANODE AND THE PLATE FOR AN ADDITIONAL PERIOD OF 20 TO 60 SECOND, TO DEPOSIT A LAYER OF DULL, FINE-GRAINED CHROMIUM ON SAID UNGAINED SURFACE, THE TEMPERATURE OF THE BATH BEING MAINTAINED, AT SAID SELECTED CURRENT DENSITY PER SQUARE INCH, WITHIN THE RANGE DEFINED BY THE FOLLOWING LIMITS: 95* F. TO 97.5* F. AT 0.75 AMPERE(S) 95* F. TO 102.0* F. AT 1.0 AMPERE(S) 95* F. TO 112.5* F. AT 1.5 AMPERE(S) 95* F. TO 122.0* F. AT 2.0 AMPERE(S) 102* F. TO 129.0* F. AT 3.0 AMPERE(S) 109* F. TO 130.0* F. AT 4.0 AMPERE(S) 117* F. TO 131.0* F. AT 5.0 AMPERE(S) 118* F. TO 132.0* F. AT 6.0 AMPERE(S) 119* F. TO 133.0* F. AT 7.0 AMPERE(S) 120* F. TO 133.5* F. AT 8.0 AMPERE(S) 121* F. TO 134.5* F. AT 9.0 AMPERE(S) 122* F. TO 135.5* F. AT 10.0 AMPERE(S)
References Cited (Backward Citations)
US927577A
Cited
US1151459A
Cited
US1603779A
Cited
US1811734A
Cited
US1680097A
Cited
US1750418A
Cited
US1909716A
Cited
GB475902A
Cited
US2214950A
Cited
US2172344A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-10 | 1957-11-09 | 1958-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-10 | 1961-11-09 | 1962-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-10 | 1965-11-09 | 1966-05-11 | $7700.00 | Window Closed / Lapsed |