US3209581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous melt indexer
Assignee: Dow Chemical Co
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Filing: 1962-02-07
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Granted: 1965-10-05
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Expires: 1982-02-07
Abstract
No abstract record available.
Inventors
- 👤 Robert A Crane
- 👤 Stanley A Murdock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:47
CPC Classifications
G; G01; G01N; G01N11/00; G01N11/02; G01N11/04; G01N11/08; B; B29; B29C; B29C48/00; B29C48/25; B29C48/92; B29C2948/00; B29C2948/92; B29C2948/92009; B29C2948/92019; B29C2948/92085; B29C2948/92104; B29C2948/922; B29C2948/92209; B29C2948/92323; B29C2948/92457; B29C2948/92504; B29C2948/92676; B29C2948/92704; B29C2948/92819; B29C2948/92857; B29C2948/92876; B29C2948/92952; B29C2948/9298; B29C48/03; G01N33/00; G01N33/44; G01N33/442
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
149 words
A MELT INDEXER FOR USE IN THE CONTINUOUS DETERMINATION OF THE MELT INDEX OF A POLYMERIC MATERIAL COMPRISING IN COMBINATION, A METERING PUMP ARRANGED FOR RECEIPT OF A SAMPLE STREAM OF POLYMERIC MATERIAL FROM A MAIN STREAM, A CONSTANT SPEED MOTOR FOR OPERATION OF SAID PUMP, A CAPILLARY ARRANGED FOR RECEIPT OF A SAMPLE STREAM OF POLYMERIC MATERIAL FROM SAID PUMP, SAID CAPILLARY BEING FURTHER ARRANGED TO DISCHARGE SAID SAMPLE STREAM OF MATERIAL TO ATMOSPHERE, HEATING MEANS FOR MAINTAINING SAID SAMPLE STREAM AT SUBSTANTIALLY THE SAME TEMPERATURE AS THE POLYMERIC MATERIAL IN THE MAIN STREAM, A PRESSURE MEASURING MEANS ARRANGED TO DETERMINE TH PRESSURE OF THE SAMPLE STREAM PRIOR TO PASSAGE THROUGH THE CAPILLARY, AND MEANS FOR AUTOMATICALLY CORRECTING THE PRESSURE DETERMNATIONS OF SAID PRESSURE MEASURING MEANS IN ACCORDANCE WITH THE TEMPERATUR OF SAID MATERIAL AT THE POINT OF PRESSURE MEASUREMENT TO COMPENSATE FOR TEMPERATURE VARIATIONS OF SAID MATERIAL.
References Cited (Backward Citations)
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Cited
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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) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |