US3699781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigerant recovery system
Assignee: Pennwalt Corp
•
Filing: 1971-08-27
•
Granted: 1972-10-24
•
Expires: 1991-08-27
Abstract
Abstract Apparatus for recovery of halogenated hydrocarbon refrigerant from defective refrigeration and air conditioning systems removes entrained moisture, chlorides, oils and sludge so that the reclaimed refrigerant is restored to original specification purity standards.
Inventors
- 👤 Larry Christopher Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:46
CPC Classifications
B; B60; B60H; B60H1/00; B60H1/00507; B60H1/00585; F; F25; F25B; F25B43/00; F25B45/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
16 words
The apparatus of claim 1 wherein said compressor comprises a two stage reciprocatIng dry wall pump.
Claim 2
Dependent Claim
53 words
The apparatus of claim 2 wherein said pump includes unloading means, means for actuating said unloading means when the pressure in the discharge side of said pump exceeds a predetermined level, and means for actuating said unloading means when the pressure in the upstream side of said pump falls below a predetermined level.
Claim 3
Dependent Claim
21 words
The apparatus of claim 3 including inlet and outlet valves actuated substantially simultaneously with said means for actuating said unloading means.
Claim 4
Dependent Claim
20 words
The apparatus of claim 1 wherein said means for heating comprises an uninsulated coiled thermally conductive tube exposed to atmosphere.
Claim 5
Dependent Claim
21 words
The apparatus of claim 1 wherein said condenser comprises a finned tube, including means to blow air about said finned tube.
Claim 6
Dependent Claim
15 words
The apparatus of claim 1 wherein said dessicant dryer means comprises a regenerative molecular sieve.
Claim 7
Dependent Claim
23 words
The apparatus of claim 1 wherein said means constituting an oil strainer and separator includes an epoxy resin impregnated cellulose fiber filter cartridge.
Claim 8
Dependent Claim
18 words
The apparatus of claim 8 wherein said after cooler filter comprises an epoxy resin impregnated fiber filter cartridge.
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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |