US2729969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for automatic measurement of surface area and pore volume
Assignee: Wyeth Holdings LLC
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Filing: 1951-04-26
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Granted: 1956-01-10
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Expires: 1971-04-26
Abstract
No abstract record available.
Inventors
- 👤 William B Innes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:44
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/08; G01N15/088; G01N15/0893
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A METHOD FOR THE MEASUREMENT OF SURFACE AREAS GREATER THAN 0.5 SQUARE METER PER GRAM, WHICH COMPRISES INTRODUCING A GAS AT A CONSTANT RATE OF FLOW INTO AN EVACUATED CHAMBER CONTAINING A WEIGHTED AMOUNT OF THE MATERIAL TO BE MEASURED COOLED TO 50*-225* ABSOLUTE, MEASURING THE TIME REQUIRED TO REACH A PRESSURE RELATIVE TO SATURATION BETWEEN 0.1 AND 0.3, AND CALCULATING FROM THE TIME REQUIRED THE SURFACE AREA OF THE SAID MATERIAL.
Claim 2
Independent Claim
72 words
A METHOD FOR THE MEASUREMENT OF SURFACE AREAS GREATER THAN 0.5 SQUARE METER PER GRAM, WHICH COMPRISES INTRODUCING A GAS AT A CONSTANT RATE OF FLOW INTO AN EVACUATED CHAMBER CONTAINING A WEIGHTED AMOUNT OF THE MATERIAL TO BE MEASURED COOLED TO 50*-225* ABSOLUTE, MEASURING THE TIME REQUIRED TO REACH A PRESSURE RELATIVE TO SATURATION BETWEEN 0.1 AND 0.3, AND CALCULATING FROM THE TIME REQUIRED THE SURFACE AREA OF THE SAID MATERIAL.
References Cited (Backward Citations)
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Cited
US2293488A
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US2303890A
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US2392637A
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US2445544A
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US2604779A
Cited
US2692497A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-09 | 1959-07-11 | 1960-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-09 | 1963-07-11 | 1964-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-09 | 1967-07-11 | 1968-01-10 | $7700.00 | Window Closed / Lapsed |