US2927871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of pickling baths
Assignee: Bethlehem Steel Corp
•
Filing: 1956-03-26
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Granted: 1960-03-08
•
Expires: 1976-03-26
Abstract
No abstract record available.
Inventors
- 👤 Edgar B Mancke
- 👤 Cloyd W Shingledecker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:36
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; Y; Y10; Y10T; Y10T436/00; Y10T436/15; Y10T436/156666
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
IN A PROCESS WHEREIN A FERROUS METAL WORKPIECE IS SUBMITTED TO THE CHEMICAL ACTION OF A BATH CONTAINING AN AQUEOUS SOLUTION OF A SULFURIC ACID TREATING AGENT OF PREDETERMINED CONCENTRATION AND WHEREIN FERROUS SULFATE IS FORMED BY REACTION BETWEEN SAID WORKPIECE AND SAID TREATING AGENT, THE METHOD OF MAINTAINING IN BALANCE SAID BATH WHICH COMPRISES DETERMINING THE CONCENTRATION OF SAID ACID BY MEASURING THE CONDUCTIVITY OF THE BATH AND WHEN SAID CONDUCTIVITY FALLS BELOW A PREDETERMINED LIMIT, AUTOMATICALLY ADDING CONCENTRATED SULFURIC ACID TO THE BATH IN AN AMOUNT SUFFICIENT TO INCREASE THE CONDUCTIVITY OF THE BATH TO A PREDETERMINED LIMIT, DETERMINING THE CONCENTRATION OF SAID SULFATE BY INDEPENDENTLY MEASURING THE SPECIFIC GRAVITY OF THE BATH, AND WHEN SAID SPECIFIC GRAVITY RISES ABOVE A PREDETERMINED LIMIT, AUTOMATICALLY ADDING TO THE BATH A SOLUTION OF SULFURIC ACID IN A CONCENTRATION APPROXIMATELY EQUAL TO THE PREDETERMINED TREATING AGENT CONCENTRATION AND IN AN AMOUNT SUFFICIENT TO REDUCE THE SPECIFIC GRAVITY OF SAID BATH TO A PREDETERMINED LIMIT.
Claim 2
Dependent Claim
163 words
IN A PROCESS WHEREIN A FERROUS METAL WORKPIECE IS SUBMITTED TO THE CHEMICAL ACTION OF A BATH CONTAINING AN AQUEOUS SOLUTION OF A SULFURIC ACID TREATING AGENT OF PREDETERMINED CONCENTRATION AND WHEREIN FERROUS SULFATE IS FORMED BY REACTION BETWEEN SAID WORKPIECE AND SAID TREATING AGENT, THE METHOD OF MAINTAINING IN BALANCE SAID BATH WHICH COMPRISES DETERMINING THE CONCENTRATION OF SAID ACID BY MEASURING THE CONDUCTIVITY OF THE BATH AND WHEN SAID CONDUCTIVITY FALLS BELOW A PREDETERMINED LIMIT, AUTOMATICALLY ADDING CONCENTRATED SULFURIC ACID TO THE BATH IN AN AMOUNT SUFFICIENT TO INCREASE THE CONDUCTIVITY OF THE BATH TO A PREDETERMINED LIMIT, DETERMINING THE CONCENTRATION OF SAID SULFATE BY INDEPENDENTLY MEASURING THE SPECIFIC GRAVITY OF THE BATH, AND WHEN SAID SPECIFIC GRAVITY RISES ABOVE A PREDETERMINED LIMIT, AUTOMATICALLY ADDING TO THE BATH A SOLUTION OF SULFURIC ACID IN A CONCENTRATION APPROXIMATELY EQUAL TO THE PREDETERMINED TREATING AGENT CONCENTRATION AND IN AN AMOUNT SUFFICIENT TO REDUCE THE SPECIFIC GRAVITY OF SAID BATH TO A PREDETERMINED LIMIT.
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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) | 1963-03-08 | 1963-09-07 | 1964-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-08 | 1967-09-07 | 1968-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-08 | 1971-09-07 | 1972-03-08 | $7700.00 | Window Closed / Lapsed |