Patent CH586689A5 successfully refreshed from Google Patents.
US2521648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Etching process
Assignee: Croname Inc
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Filing: 1945-01-29
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Granted: 1950-09-05
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Expires: 1965-01-29
Abstract
No abstract record available.
Inventors
- 👤 Ernest B Ott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:48
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/02; B; B44; B44C; B44C1/00; B44C1/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
THE HEREIN DISCLOSED METHOD OF PRODUCING ETCHED ARTICLES WHICH COMPRISES APPLYING DESIGNS IN PERMANENT ENAMEL FORMING RESIST TO THE OPPOSITE SIDES OF A PLATE, EMPLOYING THE SAME ORIGINAL EDGE OF THE PLATE FOR REGISTER OF THE DESIGNS ON BOTH SIDES, TREATING TO CONVERT THE ENAMEL TO HARD, PERMANENT ENAMEL RESIST ON BOTH SIDES OF THE PLATE AND THEN SIMULTANEOUSLY ETCHING BOTH SIDES OF THE PLATE IN A SINGLE ETCHING OPERATION.
Claim 2
Dependent Claim
70 words
THE HEREIN DISCLOSED METHOD OF PRODUCING ETCHED ARTICLES WHICH COMPRISES APPLYING DESIGNS IN PERMANENT ENAMEL FORMING RESIST TO THE OPPOSITE SIDES OF A PLATE, EMPLOYING THE SAME ORIGINAL EDGE OF THE PLATE FOR REGISTER OF THE DESIGNS ON BOTH SIDES, TREATING TO CONVERT THE ENAMEL TO HARD, PERMANENT ENAMEL RESIST ON BOTH SIDES OF THE PLATE AND THEN SIMULTANEOUSLY ETCHING BOTH SIDES OF THE PLATE IN A SINGLE ETCHING OPERATION.
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) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |