Patent US3273580A successfully refreshed from Google Patents.
US3273580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solution concentration control and make-up system
Assignee: —
•
Filing: —
•
Granted: 1966-09-20
•
Expires: 1983-09-20
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:11
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/06; G05; G05D; G05D21/00; G05D21/02; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2499; Y10T137/2509
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
IN A SYSTEM FOR MAINTAINING THE CONCENTRATION OF A PROCESSING SOLUTION SUBSTANTIALLY AT A PREDETERMINED LEVEL, A SOLUTION RESISTANCE SENSING CHAMBER CONTAINING A REFERENCE CELL AN AN ACTUATING CELL, A RESERVOIR TANK OF MAKE-UP SOLUTION NORMALLY AT A RELATIVELY HIGH LEVEL OF CONCENTRATION, A SUPPLY OF SAID PROCESSING SOLUTION, AND PUMP AND CONDUIT MEANS FOR DRAWING PROCESSING SOLUTION FROM ITS TANK THROUGH SAID SENSING CHAMBER AND INTO AND THROUGH SAID PUMP FOR DELIVERY BACK TO SAID SUPPLY OF PROCESSING SOLUTION AND ALTERNATIVELY TO SAID RESERVOIR TANK,
Claim 2
Dependent Claim
86 words
IN A SYSTEM FOR MAINTAINING THE CONCENTRATION OF A PROCESSING SOLUTION SUBSTANTIALLY AT A PREDETERMINED LEVEL, A SOLUTION RESISTANCE SENSING CHAMBER CONTAINING A REFERENCE CELL AN AN ACTUATING CELL, A RESERVOIR TANK OF MAKE-UP SOLUTION NORMALLY AT A RELATIVELY HIGH LEVEL OF CONCENTRATION, A SUPPLY OF SAID PROCESSING SOLUTION, AND PUMP AND CONDUIT MEANS FOR DRAWING PROCESSING SOLUTION FROM ITS TANK THROUGH SAID SENSING CHAMBER AND INTO AND THROUGH SAID PUMP FOR DELIVERY BACK TO SAID SUPPLY OF PROCESSING SOLUTION AND ALTERNATIVELY TO SAID RESERVOIR TANK,
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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) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |