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The patent EP2983218 was granted to Karlsruher Institut FR Technologie on Oct 18, 2023. The application was filed on Aug 6, 2014 under application number EP14002754A. The patent is currently recorded with a legal status of "Patent Maintained As Amended".
A method and apparatus for enhancing the critical current and reducing AC losses of superconducting devices by locally modifying the superconducting material's critical current density. The method involves identifying regions of reduced critical current density within the device, such as inner turns of coils or filaments in striated tapes, and applying one or more of the following modifications: decreasing the cooling temperature, modifying the composition or type of superconducting material, varying the cross-sectional area of the superconducting material, or using temperature variations to enhance critical current density. The apparatus includes a system for designing and optimizing superconducting devices based on these principles.

Patent oppositions filed by competitors challenge the validity of a granted patent. These oppositions are typically based on claims of prior art, lack of novelty, or non-obviousness. They are a key part of the process for determining a patent's strength and enforceability.
| Company | Opposition Date | Representative | Opposition Status |
|---|---|---|---|
| TOKAMAK ENERGY | Dec 10, 2020 | MARKS & CLERK | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| OPPOSITION | JP2007172978 |
| OPPOSITION | JPH04167404 |
| OPPOSITION | US2007111893 |
| OPPOSITION | US3394330 |
| SEARCH | JP2007172978 |
| SEARCH | JP2009238888 |
| SEARCH | JP2013037838 |
| SEARCH | JPH05226707 |
| SEARCH | US2007111893 |
| SEARCH | US5173678 |
| SEARCH | US5310705 |
| SEARCH | WO2006021003 |
| SEARCH | WO9520228 |
The dossier documents provide a comprehensive record of the patent's prosecution history - including filings, correspondence, and decisions made by patent offices - and are crucial for understanding the patent's legal journey and any challenges it may have faced during examination.
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Decision to grant a European patent
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Filing of the translations of the claims
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French translation of claims
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German translation of the claims
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Intention to grant (signatures)
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Text intended for grant (clean copy)
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Amended claims with annotations
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Claims
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Description
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Annex to the communication
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Communication from the Examining Division
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Amended description with annotations
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Description
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Annex to the communication
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Communication from the Examining Division
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Nov 14, 2017
Examination started
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(Electronic) Receipt
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Enquiry as to the processing of the file
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Letter accompanying subsequently filed items
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Letter concerning the inventor
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Amended claims with annotations
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Letter concerning fees and payments
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Payment of fees and costs
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Notification of forthcoming publication
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Letter concerning fees and payments
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European search opinion
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European search report
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Payment of fees and costs
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Letter concerning search matters
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Partial European search report
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Jan 30, 2015
Modified abstract
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Oct 8, 2014
Communication to designated inventor
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Communication to designated inventor
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Aug 14, 2014
Payment of fees and costs
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Aug 6, 2014
Abstract
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Aug 6, 2014
Claims
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Aug 6, 2014
Description
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Aug 6, 2014
Designation of inventor
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Drawings
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Aug 6, 2014
Request for grant of a European patent
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