US2746848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Etching
Assignee: Photo-Engravers Res Inc
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Filing: 1955-01-19
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Granted: 1956-05-22
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Expires: 1975-01-19
Abstract
No abstract record available.
Inventors
- 👤 Rexford W Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:08
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
AN AQUEOUS FERRIC CHLORIDE ETCHING SOLUTION CONTAINING THIOUREA, SAID THIOUREA BEING PRESENT IN AMOUNTS FROM ABOUT 0.4 TO 10.0 GRAMS PER LITER OF THE SOLUTION.
Claim 2
Dependent Claim
25 words
AN AQUEOUS FERRIC CHLORIDE ETCHING SOLUTION CONTAINING THIOUREA, SAID THIOUREA BEING PRESENT IN AMOUNTS FROM ABOUT 0.4 TO 10.0 GRAMS PER LITER OF THE SOLUTION.
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) | 1959-05-22 | 1959-11-21 | 1960-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-22 | 1963-11-21 | 1964-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-22 | 1967-11-21 | 1968-05-22 | $7700.00 | Window Closed / Lapsed |