US3413397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for stretching polypropylene filaments
Assignee: Eastman Kodak Co
•
Filing: 1961-08-17
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Granted: 1968-11-26
•
Expires: 1981-08-17
Abstract
No abstract record available.
Inventors
- 👤 Robert E Bierbaum
- 👤 Emmett V Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:53
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/04; D01D; D01D10/00; D01D10/02; D01D5/00; D01D5/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A PROCESS FOR TREATING POLYPROPYLENE FILAMENTARY MATERIAL HAVING A MOLECULAR WEIGHT OF AT LEAST 5,000 AND INCLUDING: DRAWING SAID FILAMENTARY MATERIAL TO AT LEAST FOUR TIMES ITS ORIGINAL UNDRAWN LENGTH IN AN ATMOSPHERE OF STEAM AT A TEMPERATURE OF AT LEAST ABOUT 100*C.; AND THEREAFTER HEAT-SETTING SAID FILAMENTARY MATERIAL IN A HOT GASEOUS ATMOSPHERE AT A TEMPERATURE OF FROM BETWEEN ABOUT 120*C. AND THE MELTING POINT OF SAID FILAMENTARY MATERIAL.
Claim 2
Dependent Claim
70 words
A PROCESS FOR TREATING POLYPROPYLENE FILAMENTARY MATERIAL HAVING A MOLECULAR WEIGHT OF AT LEAST 5,000 AND INCLUDING: DRAWING SAID FILAMENTARY MATERIAL TO AT LEAST FOUR TIMES ITS ORIGINAL UNDRAWN LENGTH IN AN ATMOSPHERE OF STEAM AT A TEMPERATURE OF AT LEAST ABOUT 100*C.; AND THEREAFTER HEAT-SETTING SAID FILAMENTARY MATERIAL IN A HOT GASEOUS ATMOSPHERE AT A TEMPERATURE OF FROM BETWEEN ABOUT 120*C. AND THE MELTING POINT OF SAID FILAMENTARY MATERIAL.
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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) | 1971-11-26 | 1972-05-27 | 1972-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-26 | 1976-05-27 | 1976-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-26 | 1980-05-27 | 1980-11-26 | $7700.00 | Window Closed / Lapsed |