US4008964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of measuring the pitch of twisted threads
Assignee: Erwin Sick GmbH Optik Elektronik
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Filing: 1975-05-05
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Granted: 1977-02-22
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Expires: 1995-05-05
Abstract
Abstract The pitch of twisted threads are measured by illuminating the threads with monochromatic light, especially a laser, to throw on a receiving surface a diffraction image from which the pitch is evaluated, preferably automatically by optical scanning and computing.
Inventors
- 👤 Johann Plockl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:46
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A method of measuring the pitch of a twisted thread having a plurality of turns, comprising: illuminating a plurality of said turns simultaneously from a direction transverse to the length of the thread with monochromatic light, receiving the diffraction image from said illuminated turns on a receiving surface disposed behind the thread, and determining the pitch of said thread from the positions of the diffraction maxima of said image.
Claim 2
Independent Claim
69 words
A method of measuring the pitch of a twisted thread having a plurality of turns, comprising: illuminating a plurality of said turns simultaneously from a direction transverse to the length of the thread with monochromatic light, receiving the diffraction image from said illuminated turns on a receiving surface disposed behind the thread, and determining the pitch of said thread from the positions of the diffraction maxima of said image.
References Cited (Backward Citations)
US3709610A
Cited
US3804529A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-22 | 1980-08-23 | 1981-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-22 | 1984-08-23 | 1985-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-22 | 1988-08-23 | 1989-02-22 | $7700.00 | Window Closed / Lapsed |