US2788657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for surface area and pore volume measurement by desorption
Assignee: Wyeth Holdings LLC
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Filing: 1953-11-20
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Granted: 1957-04-16
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Expires: 1973-11-20
Abstract
No abstract record available.
Inventors
- 👤 William B Innes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:55
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/08; G01N15/088; G01N15/0893
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A METHOD FOR THE MEASUREMENT OF SURFACE AREAS GREATER THAN 0.5 SQUARE METER PER GRAM WHICH COMPRISES PLACING THE MATERIAL TO BE MEASURED IN EQUILIBRIUM WITH A GAS AT A CONSTANT PRESSURE BELOW 0.3 OF THE EQUILIBRIUM PRESSURE OF THE SAID GAS WITH THE LIQUID FORM OF SAID GASAT THE TEMPERATURE AT WHICH SAID MATERIAL IS HELD, SAID TEMPERATURE BEING BETWEEN 50-195* ABSOLUTE; MEASURING THE AMOUNT OF GAS DESORBED ON HEATING SAID MATERIAL TO
Claim 2
Independent Claim
74 words
A METHOD FOR THE MEASUREMENT OF SURFACE AREAS GREATER THAN 0.5 SQUARE METER PER GRAM WHICH COMPRISES PLACING THE MATERIAL TO BE MEASURED IN EQUILIBRIUM WITH A GAS AT A CONSTANT PRESSURE BELOW 0.3 OF THE EQUILIBRIUM PRESSURE OF THE SAID GAS WITH THE LIQUID FORM OF SAID GASAT THE TEMPERATURE AT WHICH SAID MATERIAL IS HELD, SAID TEMPERATURE BEING BETWEEN 50-195* ABSOLUTE; MEASURING THE AMOUNT OF GAS DESORBED ON HEATING SAID MATERIAL TO
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) | 1960-04-15 | 1960-10-15 | 1961-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-15 | 1964-10-15 | 1965-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-15 | 1968-10-15 | 1969-04-16 | $7700.00 | Window Closed / Lapsed |