US2828192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for etching metals
Assignee: Turco Products Inc
•
Filing: 1954-10-04
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Granted: 1958-03-25
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Expires: 1974-10-04
Abstract
No abstract record available.
Inventors
- 👤 William P Langsfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:26
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
THE PROCESS OF ETCHING A METAL WORK PIECE IN AN ETCHING SOLUTION CONTAINING A LAYER OF FORTH ON THE SURFACE THEREOF, WHICH COMPRISES PASSING SAID WORK PIECE THROUGH SAID LAYER INTO SAID SOLUTION, ETCHING SAID WORK PIECE IN SAID SOLUTION, PASSING SAID WORK PIECE OUT OF SAID SOLUTION AND THROUGH SAID FORTH LAYER, AND DIRECTING A MOIST AIR STREAM FROM A POINT ABOVE THE SURFACE OF THE FROTH INTO SAID FROTH AT AN ACUTE ANGLE TO THE SURFACE OF SAID SOLUTION BELOW THE FROTH LINE AND AGAINST SAID WORK PIECE DURING PASSAGE THEREOF THROUGH SAID FROTH LAYER BOTH INTO AND OUT OF SAID SOLUTION.
Claim 2
Dependent Claim
104 words
THE PROCESS OF ETCHING A METAL WORK PIECE IN AN ETCHING SOLUTION CONTAINING A LAYER OF FORTH ON THE SURFACE THEREOF, WHICH COMPRISES PASSING SAID WORK PIECE THROUGH SAID LAYER INTO SAID SOLUTION, ETCHING SAID WORK PIECE IN SAID SOLUTION, PASSING SAID WORK PIECE OUT OF SAID SOLUTION AND THROUGH SAID FORTH LAYER, AND DIRECTING A MOIST AIR STREAM FROM A POINT ABOVE THE SURFACE OF THE FROTH INTO SAID FROTH AT AN ACUTE ANGLE TO THE SURFACE OF SAID SOLUTION BELOW THE FROTH LINE AND AGAINST SAID WORK PIECE DURING PASSAGE THEREOF THROUGH SAID FROTH LAYER BOTH INTO AND OUT OF SAID SOLUTION.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-24 | 1961-09-23 | 1962-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-24 | 1965-09-23 | 1966-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-24 | 1969-09-23 | 1970-03-25 | $7700.00 | Window Closed / Lapsed |