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US5068068A
Expired / Lapsed
US
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Method and apparatus for extrusion
Assignee: Idemitsu Kosan Co Ltd
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Filing: 1989-11-22
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Granted: 1991-11-26
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Expires: 2009-11-22
Abstract
Abstract An improved method for carrying out an extrusion is provided, wherein an extrusion material in a flowable state is passed through a die under a pressure to impart a desired shape thereto, and the extrusion is carried out while the die is resonated by an ultrasonic wave in such a manner that the resonance occurs at an n wavelength, wherein n is m/2 and m is a positive integer. Further, an apparatus suitable for carrying out this extrusion method is provided.
Inventors
- 👤 Toshihiro Furusawa
- 👤 Atsushi Satoh
- 👤 Takashi Nakajima
- 👤 Noriaki Matsugishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:42
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/14; B29C48/25; B29C48/92; B29C48/03; B29C48/05; B29C48/06; B29C48/07; B29C48/08; B29C48/09; B29C48/10; B29C48/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
72 words
An improved method of carrying out an extrusion in which an extrusion material in a flowable state is passed through a die under a pressure to impart a desired shape thereto, the improvement comprising a step of resonating the die by an ultrasonic wave at a resonance frequency of 10 kHz to 100 kHz so that the ultrasonic wave has n wavelengths, wherein n is m/2 and m is a positive integer.
Claim 2
Dependent Claim
72 words
An improved method of carrying out an extrusion in which an extrusion material in a flowable state is passed through a die under a pressure to impart a desired shape thereto, the improvement comprising a step of resonating the die by an ultrasonic wave at a resonance frequency of 10 kHz to 100 kHz so that the ultrasonic wave has n wavelengths, wherein n is m/2 and m is a positive integer.
Claim 3
Dependent Claim
28 words
An improved method of carrying out an extrusion according to claim 1, wherein the amplitude of the ultrasonic resonance of the die is 0.1 μm to 100 μm.
Claim 4
Dependent Claim
45 words
An improved method of carrying out an extrusion according to claim 1, wherein the resonance frequency of the die is automatically monitored and adjusted so as to cope with momentary variations of the resonance frequency caused by momentary changes of a load in the die.
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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) | 1994-11-25 | 1995-05-27 | 1995-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-25 | 1999-05-27 | 1999-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-25 | 2003-05-27 | 2003-11-26 | $7700.00 | Window Closed / Lapsed |