File:US3824437.jpg
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摘要
| 描述 |
English: F. Blaschke's US3824437 'Method of Controlling Asynchronous Machines', image of the patent with no notice of exception so is in the public domain |
| 日期 | |
| 来源 | US Patent 3824437 |
| 作者 | Felix Blaschke |
许可协议
|
The text and illustrations of US patents published before March 1, 1989 are in the public domain unless the patent text contains a specific notice that portions are copyrighted. See 37 CFR 1.71(d), 37 CFR 1.84(s)
The original patent contains no such notice, so its contents are in the public domain. Note: This only applies to images published before March 1, 1989. Patents published after that date are most likely copyrighted, unless in the public domain for another reason, such as {{PD-ineligible}}. |
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| 日期/时间 | 缩略图 | 大小 | 用户 | 备注 | |
|---|---|---|---|---|---|
| 当前 | 2012年5月10日 (四) 20:04 | | 459 × 286（30 KB） | wikimediacommons>Cblambert | Trying to sort out copyright infringement issue. |
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