Patent US4692999A successfully refreshed from Google Patents.
Patent US3075895A successfully refreshed from Google Patents.
US3075895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing plates for electromechanical engraving
Assignee: GEN DEV CORP
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Filing: 1960-02-15
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Granted: 1963-01-29
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Expires: 1980-02-15
Abstract
No abstract record available.
Inventors
- 👤 William D Maclean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:34
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/024; C25D11/06; C25D11/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
THE PROCESS OF REPRODUCING INDICIA HAVING GRADATIONS OF LIGHT AND DARK ON AN ENGRAVING PLATE FOR LETTER PRESS PRINTING PURPOSES, COMPRISING THE STEPS OF FORMING AN OXIDE COATING ON THE SURFACE OF AN ALUMINUM SHEET TO PRODUCE A SURFACE HAVING THE SOFT, POROUS CHARACTERISTICS OF AN ALUMINUM SURFACE PRODUCED BY IMMERSING THE SHEET AS ONE OF TWO ELECTRODES IN A 70* BATH OF 50% BY WEIGHT SOLUTION OF H2SO4 AND APPLYING A VOLTAGE OF 12-18 VOLTS FOR ONE MINUTE BETWEEN ELECTRODES TO PROVIDE 180 AMPERES PER SQUARE FOOT AT THE SURFACE OF SAID SHEET, MECHANICALLY PIERCING THE SURFACE OF SAID SHEET AT REGULARLY
Claim 2
Dependent Claim
103 words
THE PROCESS OF REPRODUCING INDICIA HAVING GRADATIONS OF LIGHT AND DARK ON AN ENGRAVING PLATE FOR LETTER PRESS PRINTING PURPOSES, COMPRISING THE STEPS OF FORMING AN OXIDE COATING ON THE SURFACE OF AN ALUMINUM SHEET TO PRODUCE A SURFACE HAVING THE SOFT, POROUS CHARACTERISTICS OF AN ALUMINUM SURFACE PRODUCED BY IMMERSING THE SHEET AS ONE OF TWO ELECTRODES IN A 70* BATH OF 50% BY WEIGHT SOLUTION OF H2SO4 AND APPLYING A VOLTAGE OF 12-18 VOLTS FOR ONE MINUTE BETWEEN ELECTRODES TO PROVIDE 180 AMPERES PER SQUARE FOOT AT THE SURFACE OF SAID SHEET, MECHANICALLY PIERCING THE SURFACE OF SAID SHEET AT REGULARLY
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-28 | 1966-07-30 | 1967-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-28 | 1970-07-30 | 1971-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-28 | 1974-07-30 | 1975-01-29 | $7700.00 | Window Closed / Lapsed |