Patent US3221090A successfully refreshed from Google Patents.
US3221090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for increasing the strength of nonwoven arrays of polyethylene terephthalate fibers
Assignee: Kendall Co
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Filing: 1964-02-07
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Granted: 1965-11-30
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Expires: 1984-02-07
Abstract
No abstract record available.
Inventors
- 👤 Thompson Hugh Brian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:12
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A PROCESS FOR INCREASING THE STRENGTH OF NONWOVEN ARRAYS OF FIBERS COMPOSED AT LEAST IN PART OF HIGHLY POLYMERIZED POLYETHYLENE TEREPHTHALATE FIBERS, SAID POLYETHYLENE TEREPHTHALATE FIBERS CONTAINING WITHIN THE FIBER BODY A LOWER MOLECULAR WEIGHT SUBSTANCE IN THE FORM OF A CYCLIZED TRIMER OF TEREPHTHALIC ACID AND ETHYLENE GLYCOL, WHICH COMPRISES HEATING SAID ARRAYS TO PROMOTE THE MIGRATION OF SAID TRIMER TO THE SURFACES OF SAID FIBERS, SAID HEATING BEING CARRIED OUT AT A TEMPERATURE OF BETWEEN ABOUT 250*F. AND ABOUT 400*F., CONTINUING SAID HEATING UNTIL SAID TRIMER HAS MIGRATED THROUGH THE FIBER SURFACES AND HAS BECOME ADHERENT THERETO IN THE FORM OF ROUGH PROJECTING PROTUBERANCES, AND DISCONTINUING THE HEATING PROCESS AND ALLOWING THE ARRAY TO COOL BEFORE SAID TRIMER HAS SUBLIMED FROM SAID SURFACE.
Claim 2
Dependent Claim
125 words
A PROCESS FOR INCREASING THE STRENGTH OF NONWOVEN ARRAYS OF FIBERS COMPOSED AT LEAST IN PART OF HIGHLY POLYMERIZED POLYETHYLENE TEREPHTHALATE FIBERS, SAID POLYETHYLENE TEREPHTHALATE FIBERS CONTAINING WITHIN THE FIBER BODY A LOWER MOLECULAR WEIGHT SUBSTANCE IN THE FORM OF A CYCLIZED TRIMER OF TEREPHTHALIC ACID AND ETHYLENE GLYCOL, WHICH COMPRISES HEATING SAID ARRAYS TO PROMOTE THE MIGRATION OF SAID TRIMER TO THE SURFACES OF SAID FIBERS, SAID HEATING BEING CARRIED OUT AT A TEMPERATURE OF BETWEEN ABOUT 250*F. AND ABOUT 400*F., CONTINUING SAID HEATING UNTIL SAID TRIMER HAS MIGRATED THROUGH THE FIBER SURFACES AND HAS BECOME ADHERENT THERETO IN THE FORM OF ROUGH PROJECTING PROTUBERANCES, AND DISCONTINUING THE HEATING PROCESS AND ALLOWING THE ARRAY TO COOL BEFORE SAID TRIMER HAS SUBLIMED FROM SAID SURFACE.
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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |