Patent US3273379A successfully refreshed from Google Patents.
US3273379A
Expired / Lapsed
US
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Method of locating leaks
Assignee: Airco Inc
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Filing: 1963-09-17
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Granted: 1966-09-20
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Expires: 1983-09-17
Abstract
No abstract record available.
Inventors
- 👤 John J Rendos
- 👤 Robert R Banks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:05
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/20; G01M3/22; G01M3/226; G01M3/228
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A METHOD FOR DETERMINING THE EXISTENCE AND APPROXIMATE LOCATION OF A POINT OF LEAD BETWEEN ADJACENT PASSES OF HEAT EXCHANGE APPARATUS, EACH HAVING A DIRECTION OF FLOW, COMPRISING THE STEPS OF INTRODUCING CONDENSIBLE TRACER MATERIALS HAVING RESPECTIVELY DIFFERENT FREEZING POINTS ALONG THE PATH OF ONE PASS OF THE HEAT EXCHANGE APPARATUS, SAID PATH BEING ONE OF DECREASING TEMPERATURE ALONG THE DIRECTION OF FLOW, CONDUCTING A STREAM THROUGH THE DJACENT PASS, AND ANALYZING SAID STREAM FOR TRACES OF SAID CONDENSIBLE TRACER MATERIALS.
Claim 2
Independent Claim
81 words
A METHOD FOR DETERMINING THE EXISTENCE AND APPROXIMATE LOCATION OF A POINT OF LEAD BETWEEN ADJACENT PASSES OF HEAT EXCHANGE APPARATUS, EACH HAVING A DIRECTION OF FLOW, COMPRISING THE STEPS OF INTRODUCING CONDENSIBLE TRACER MATERIALS HAVING RESPECTIVELY DIFFERENT FREEZING POINTS ALONG THE PATH OF ONE PASS OF THE HEAT EXCHANGE APPARATUS, SAID PATH BEING ONE OF DECREASING TEMPERATURE ALONG THE DIRECTION OF FLOW, CONDUCTING A STREAM THROUGH THE DJACENT PASS, AND ANALYZING SAID STREAM FOR TRACES OF SAID CONDENSIBLE TRACER MATERIALS.
References Cited (Backward Citations)
No citation records indexed.
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 |