US3606689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for heat treatment of filament
Assignee: Toyobo Co Ltd
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Filing: 1969-02-20
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Granted: 1971-09-21
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Expires: 1989-02-20
Abstract
Abstract AN APPARATUS FOR TREATMENT OF FILAMENT IN THE RELAXED STATE WITH HOT GAS STREAM WHICH COMPRISES A HEATING CYLINDER, AN INLET PORTION FOR THE FILAMENT PROVIDED AT ONE END OF THE CYLINDER, AN OUTLET FOR THE FILAMENT PIROVIDED AT THE OTHER END, AND AN INLET FOR A SECONDARY GAS STREAM PROVIDED NEAR THE INLET PORTION, THE FILAMENT BEING JOINED BY THE PRIMARY GAS STREAM AT THE INLET PORTION AND THEN INTRODUCED THROUGH THE INLET PORTION INTO THE CYLINDER. BY THE USE OF SUCH APPARATUS, A FILAMENT CAN BE HEAT-TREATED IN THE RELAXED STATE AT A HIGH EFFICIENCY OF OPERATION.
Inventors
- 👤 Tatsuki Matsuo
- 👤 Takashi Fukuda
- 👤 Shosuke Nanri
- 👤 Katsuya Ishitobi
- 👤 Ryunosuke Masuda
- 👤 Hiroshi Okano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:12
CPC Classifications
D; D02; D02J; D02J1/00; D02J1/22; D02J1/228; D01; D01D; D01D10/00; D01D10/02; D01D10/04; D01D10/0436; D01D10/0481; D02G; D02G1/00; D02G1/20; D02G1/205
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |