US2943057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inhibiting copper plating in closed refrigeration systems
Assignee: EIDP Inc
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Filing: 1955-11-08
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Granted: 1960-06-28
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Expires: 1975-11-08
Abstract
No abstract record available.
Inventors
- 👤 Jr Bernhardt J Eiseman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:29
CPC Classifications
F; F25; F25B; F25B47/00; F25B47/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A PROCESS FOR INHIBITING COPPER PLATING IN A CLOSED REFRIGERATION SYSTEM CONTAINING STEEL AND COPPER WHEREIN SAID METAL ARE CONTACTED WITH A MIXTURE OF A HYDROCARBON LUBRICATING OIL AND A HALOGENATED HYDROCARBON REFRIGERANT IN THE PRESENCE OF AT LEAST 0.3% BY WEIGHT, BASED ON THE REFRIGERANT, OF A POLYMERIC MATERIAL WHICH IS SOLID AT 300*F. SAID POLYMERIC MATERIAL BEING POSITIONED IN CONTACT WITH SAID MIXTURE, AND HAS A VISCOSITY AVERAGE MOLECULAR WEIGHT OF AT LEAST 20,000, SAID POLYMERIC MATERIAL BEING TAKEN FROM THE CLASS CONSISTING OF POLYACRYLONITRILES, COPOLYMERS, TERPOLYMERS AND INTERPOLYMERS OF ACRYLONITRILE, THE ACRYLONITRILE COMPONENT PREDOMINATING IN SAID COPOLYMERS, TERPOLYMERS AND INTERPOLYMERS, AND, SAID POLYMERIC MATERIAL BEING SUBSTANTIALLY INSOLUBLE IN SAID REFRIGERATION SYSTEM.
Claim 2
Dependent Claim
114 words
A PROCESS FOR INHIBITING COPPER PLATING IN A CLOSED REFRIGERATION SYSTEM CONTAINING STEEL AND COPPER WHEREIN SAID METAL ARE CONTACTED WITH A MIXTURE OF A HYDROCARBON LUBRICATING OIL AND A HALOGENATED HYDROCARBON REFRIGERANT IN THE PRESENCE OF AT LEAST 0.3% BY WEIGHT, BASED ON THE REFRIGERANT, OF A POLYMERIC MATERIAL WHICH IS SOLID AT 300*F. SAID POLYMERIC MATERIAL BEING POSITIONED IN CONTACT WITH SAID MIXTURE, AND HAS A VISCOSITY AVERAGE MOLECULAR WEIGHT OF AT LEAST 20,000, SAID POLYMERIC MATERIAL BEING TAKEN FROM THE CLASS CONSISTING OF POLYACRYLONITRILES, COPOLYMERS, TERPOLYMERS AND INTERPOLYMERS OF ACRYLONITRILE, THE ACRYLONITRILE COMPONENT PREDOMINATING IN SAID COPOLYMERS, TERPOLYMERS AND INTERPOLYMERS, AND, SAID POLYMERIC MATERIAL BEING SUBSTANTIALLY INSOLUBLE IN SAID REFRIGERATION SYSTEM.
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) | 1963-06-28 | 1963-12-28 | 1964-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-28 | 1967-12-28 | 1968-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-28 | 1971-12-28 | 1972-06-28 | $7700.00 | Window Closed / Lapsed |