US3683678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for molecular weight measurement
Assignee: EIDP Inc
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Filing: 1971-05-03
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Granted: 1972-08-15
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Expires: 1991-05-03
Abstract
Abstract Method and apparatus for rapid measurement of average molecular weight of polymers wherein a specimen is placed in solution and contacted with a solid material into which substantial permeation occurs as a function of molecular size, then determining the average molecular weight as a function of the ratio of asreceived and final equilibrium polymer concentrations one to the other.
Inventors
- 👤 Wallace W Yau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:18
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/88; G01N2030/8809; G01N2030/884; G01N2030/885
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
155 words
Apparatus for determining the average molecular weight of a polymeric material comprising, in combination, a principal flow circuit conduit provided with means for introducing a dilute solution of said polymeric material in a solvent, pump means circulating said solution around said principal flow circuit conduit, analytical means obtaining an index of the concentration of said polymeric material dissolved in said solvent, a subsidiary flow circuit conduit connected through a flow diversion valve between said pump and said analytical means, means in series flow circuit within said subsidiary flow circuit conduit loaded with a mass of porous material having the property of permeation loading with polymer molecules as a function of molecular size, discharge means communicating with said principal flow circuit conduit for flush removal of solvent and dissolved polymer after each apparatus run, and means for introducing said solvent, free of said polymeric material, to said principal and subsidiary flow circuits as a cleansing flush.
References Cited (Backward Citations)
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US3354317A
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US3586626A
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US3598245A
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US3536614A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |