Patent US3521441A successfully refreshed from Google Patents.
US3521441A
Expired / Lapsed
US
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Process and apparatus for reducing yarn waste in draw-twisters
Assignee: Maschinenfabrik Rieter AG
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Filing: 1967-12-07
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Granted: 1970-07-21
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Expires: 1987-12-07
Abstract
No abstract record available.
Inventors
- 👤 Hansruedi Lamparter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:04
CPC Classifications
D; D01; D01H; D01H1/00; D01H1/14; D01H1/20; D01H1/22; D01H1/28; D01H1/30; D01H1/305; D01H1/32
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) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |