US2580983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibitors in absorption refrigeration system
Assignee: Electrolux AB
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Filing: 1946-02-08
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Granted: 1952-01-01
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Expires: 1966-02-08
Abstract
No abstract record available.
Inventors
- 👤 Widell Nils Erik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:23
CPC Classifications
F; F25; F25B; F25B47/00; F25B47/003; Y; Y10; Y10S; Y10S62/00; Y10S62/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
IN THE ART OF REFRIGERATION EMPLOYING AN HERMETICALLY SEALED ABSORPTION REFRIGERATING SYSTEM FORMED OF FERROUS METAL AND HAVING AN ABSORPTION SOLUTION CIRCUIT IN WHICH AQUEOUS AMMONIA SOLUTION IS CIRCULATED THROUGH AND BETWEEN A PLACE AT WHICH AMMONIA IS EXPELLED FROM SOLUTION AND A PLACE AT WHICH AMMONIA IS ABSORBED INTO SOLUTION, THE IMPROVEMENT WHICH COMPRISES MAINTAINING IN THE SOLUTION A SUPPLY OF SOLID LEAD CHROMATE, AND PROVIDING IN THE SOLUTION AN ALKALI NITRITE.
Claim 2
Dependent Claim
73 words
IN THE ART OF REFRIGERATION EMPLOYING AN HERMETICALLY SEALED ABSORPTION REFRIGERATING SYSTEM FORMED OF FERROUS METAL AND HAVING AN ABSORPTION SOLUTION CIRCUIT IN WHICH AQUEOUS AMMONIA SOLUTION IS CIRCULATED THROUGH AND BETWEEN A PLACE AT WHICH AMMONIA IS EXPELLED FROM SOLUTION AND A PLACE AT WHICH AMMONIA IS ABSORBED INTO SOLUTION, THE IMPROVEMENT WHICH COMPRISES MAINTAINING IN THE SOLUTION A SUPPLY OF SOLID LEAD CHROMATE, AND PROVIDING IN THE SOLUTION AN ALKALI NITRITE.
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) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |