US3457338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for crimping polypropylene filaments
Assignee: Dow Chemical Co
•
Filing: 1964-09-21
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Granted: 1969-07-22
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Expires: 1984-09-21
Abstract
No abstract record available.
Inventors
- 👤 Lloyd Edward Lefevre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:54
CPC Classifications
D; D02; D02J; D02J1/00; D02J1/22; D02J1/229; D01; D01F; D01F6/00; D01F6/02; D01F6/04; D01F6/06; D02G; D02G1/00; D02G1/02; D02G1/0286; D02J1/225; D02J1/226
Claims Analysis
Total Claims: 0
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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) | 1972-07-21 | 1973-01-20 | 1973-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-21 | 1977-01-20 | 1977-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-21 | 1981-01-20 | 1981-07-22 | $7700.00 | Window Closed / Lapsed |