Patent US3942667A successfully refreshed from Google Patents.
Patent US2701186A successfully refreshed from Google Patents.
US2701186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making photo engraving plate
Assignee: Wire Coating & Manufacturing Co
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Filing: 1954-04-29
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Granted: 1955-02-01
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Expires: 1974-04-29
Abstract
No abstract record available.
Inventors
- 👤 Robert T Hendrich
- 👤 Jr Dudley L O'brien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:37
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
THE METHOD OF ETCHING THE SURFACE OF A METAL OBJECT HAVING LOCAL AREAS THEREON MASKED WITH AND ACID-RESISTANT COATING AND SIMULTANEOUSLY BANKING THE SIDES OF THE RELIEVED PORTIONS OF THE ETCHED SURFACE TO PROTECT THEM AGAINST UNDERCUTTING WHICH COMPRISES CONTACTING SUCH PARTIALLY MASKED SURFACE WITH AN ACIDIC AQUEOUS MEDIUM WHICH WILL CORRODE THE UNMASKED AREAS OF SAID SURFACE AND THEREBY CREATE AN ELECTRICAL POTENTIAL ACROSS THE INTERFACES BETWEEN THE MASKED AND UNMASKED PORTIONS OF SAID SURFACE, PROVIDING IN SAID SOLUTION A HYDROSOL AND CONTINUING SAID CONTACT ACIDIC MEDIUM WITH SAID SURFACE IN THE PRESENCE OF SAID HYDROSOL TO FORM A PRECIPITATE AT SAID INTERFACES CREATING A BANK TO PROTECT SAID RELIVED PORTIONS FROM UNDERCUTTING.
Claim 2
Independent Claim
114 words
THE METHOD OF ETCHING THE SURFACE OF A METAL OBJECT HAVING LOCAL AREAS THEREON MASKED WITH AND ACID-RESISTANT COATING AND SIMULTANEOUSLY BANKING THE SIDES OF THE RELIEVED PORTIONS OF THE ETCHED SURFACE TO PROTECT THEM AGAINST UNDERCUTTING WHICH COMPRISES CONTACTING SUCH PARTIALLY MASKED SURFACE WITH AN ACIDIC AQUEOUS MEDIUM WHICH WILL CORRODE THE UNMASKED AREAS OF SAID SURFACE AND THEREBY CREATE AN ELECTRICAL POTENTIAL ACROSS THE INTERFACES BETWEEN THE MASKED AND UNMASKED PORTIONS OF SAID SURFACE, PROVIDING IN SAID SOLUTION A HYDROSOL AND CONTINUING SAID CONTACT ACIDIC MEDIUM WITH SAID SURFACE IN THE PRESENCE OF SAID HYDROSOL TO FORM A PRECIPITATE AT SAID INTERFACES CREATING A BANK TO PROTECT SAID RELIVED PORTIONS FROM UNDERCUTTING.
References Cited (Backward Citations)
US2026603A
Cited
US2062028A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-01-31 | 1958-08-02 | 1959-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-31 | 1962-08-02 | 1963-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-31 | 1966-08-02 | 1967-02-01 | $7700.00 | Window Closed / Lapsed |