US2755660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permeability tester
Assignee: Iowa State University of Science and Technology
•
Filing: 1953-06-12
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Granted: 1956-07-24
•
Expires: 1973-06-12
Abstract
No abstract record available.
Inventors
- 👤 Kammermeyer Karl
- 👤 Brubaker David William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:50
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/08; G01N15/082; G01N15/0826
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
AN APPARATUS FOR TESTING THE PERMEABILITY OF A MATERIAL WHICH COMPRISES MEANS TO APPLY A FLUID UNDER CONSTANT PRESSURE TO AN AREA ON ONE SIDE OF THE MATERIAL, MEANS TO COLLECT THE FLUID WHICH PASSES THROUGH AN AREA OF THE MATERIAL, A HORIZONTAL CAPILLARY TUBE CONNECTED TO THE COLLECTING MEANS SO THAT THE FULID WILL PASS THROUGH THE TUBE, A SMALL SLUG OF MATERIAL FILLING A CROSS SECTIONAL AREA OF THE TUBE SO THE SLUG WILL BE PUSHED AHEAD OF THE FLUID AS IT PASSES THROUGH THE TUBE, THE MATERIAL BEING VISIBLE THROUGH THE TUBE, AND A SCALE ADJACENT THE TUBE TO MEASURE THE LENGTH OF TRAVEL OF THE SLUG FOR A GIVEN LENGTH OF TIME TO DETERMINE THE RATE OF TRAVEL OF THE SLUG AND TO THEREBY DETERMINE THE PERMEABILITY OF THE MATERIAL, SAID CAPILLARY TUBE BEING LEVEL SO THAT THE WEIGHT OF SAID SLUG WILL OFFER NO RESISTANCE TO BEING PUSHED BY THE FLUID.
Claim 2
Independent Claim
156 words
AN APPARATUS FOR TESTING THE PERMEABILITY OF A MATERIAL WHICH COMPRISES MEANS TO APPLY A FLUID UNDER CONSTANT PRESSURE TO AN AREA ON ONE SIDE OF THE MATERIAL, MEANS TO COLLECT THE FLUID WHICH PASSES THROUGH AN AREA OF THE MATERIAL, A HORIZONTAL CAPILLARY TUBE CONNECTED TO THE COLLECTING MEANS SO THAT THE FULID WILL PASS THROUGH THE TUBE, A SMALL SLUG OF MATERIAL FILLING A CROSS SECTIONAL AREA OF THE TUBE SO THE SLUG WILL BE PUSHED AHEAD OF THE FLUID AS IT PASSES THROUGH THE TUBE, THE MATERIAL BEING VISIBLE THROUGH THE TUBE, AND A SCALE ADJACENT THE TUBE TO MEASURE THE LENGTH OF TRAVEL OF THE SLUG FOR A GIVEN LENGTH OF TIME TO DETERMINE THE RATE OF TRAVEL OF THE SLUG AND TO THEREBY DETERMINE THE PERMEABILITY OF THE MATERIAL, SAID CAPILLARY TUBE BEING LEVEL SO THAT THE WEIGHT OF SAID SLUG WILL OFFER NO RESISTANCE TO BEING PUSHED BY THE FLUID.
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) | 1959-07-24 | 1960-01-23 | 1960-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-24 | 1964-01-23 | 1964-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-24 | 1968-01-23 | 1968-07-24 | $7700.00 | Window Closed / Lapsed |