Patent No. EP3824905 (titled "Method And Compositions For Cellular Immunotherapy") was filed by Fred Hutchinson Cancer Center on Aug 20, 2013. The application was issued on Jan 8, 2025.
Methods and compositions for enhancing the efficacy of chimeric antigen receptor (CAR) T cell therapy for cancer treatment. The methods involve customizing the length of the spacer region between the CAR's ligand binding domain and transmembrane domain to optimize T cell activation and proliferation in response to specific tumor antigens. The spacer length is determined based on the epitope's proximity to the cell membrane, with longer spacers used for membrane-proximal epitopes and shorter spacers used for membrane-distal epitopes. The customized CAR T cells exhibit enhanced therapeutic activity in preclinical models compared to conventional CAR T cells.

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 |
|---|---|---|
| BOULT WADE TENNANT | Oct 8, 2025 | BOULT WADE TENNANT |
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.
Date
Description
Get instant alerts for new documents
Feb 24, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Feb 19, 2026
Oct 20, 2025
Oct 20, 2025
Oct 13, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Jan 21, 2025
Dec 12, 2024
Nov 29, 2024
Nov 29, 2024
Nov 29, 2024
Nov 29, 2024
Nov 29, 2024
Nov 28, 2024
Nov 28, 2024
Nov 28, 2024
Nov 28, 2024
Nov 28, 2024
Nov 28, 2024
Nov 25, 2024
Sep 24, 2024
Sep 24, 2024
Sep 24, 2024
Jul 19, 2024
Jul 19, 2024
Jul 19, 2024
Jul 19, 2024
Jul 19, 2024
Jul 19, 2024
Jul 19, 2024
Jul 19, 2024
Jul 19, 2024
Jul 19, 2024
Jul 19, 2024
Jul 19, 2024
Jul 19, 2024
Jun 12, 2023
Jun 12, 2023
Jun 6, 2023
Jun 6, 2023
Jun 6, 2023
Jun 5, 2023
Jun 5, 2023
Jun 5, 2023
Mar 20, 2023
Mar 20, 2023
Oct 24, 2022
Oct 24, 2022
Oct 24, 2022
Aug 25, 2022
Aug 22, 2022
Aug 22, 2022
Aug 22, 2022
Aug 22, 2022
Aug 22, 2022
Aug 10, 2022
Aug 2, 2022
Aug 2, 2022
Aug 2, 2022
Aug 2, 2022
Jul 26, 2022
Jul 26, 2022
Jul 26, 2022
Jul 13, 2022
Jun 14, 2022
May 20, 2022
May 20, 2022
May 16, 2022
Apr 27, 2022
Apr 27, 2022
Apr 27, 2022
Apr 27, 2022
Apr 27, 2022
Apr 27, 2022
Mar 23, 2022
Mar 23, 2022
Mar 23, 2022
Mar 23, 2022
Mar 23, 2022
Mar 23, 2022
Mar 23, 2022
Mar 23, 2022
Mar 17, 2022
Feb 10, 2022
Feb 10, 2022
Feb 10, 2022
Jan 12, 2022
Jan 12, 2022
Jan 12, 2022
Dec 21, 2021
Dec 21, 2021
Nov 23, 2021
Nov 23, 2021
Nov 23, 2021
Nov 23, 2021
Nov 23, 2021
Nov 23, 2021
Nov 23, 2021
Nov 23, 2021
Nov 23, 2021
Nov 23, 2021
Nov 23, 2021
Nov 23, 2021
Nov 23, 2021
Nov 23, 2021
Nov 23, 2021
Nov 10, 2021
Nov 10, 2021
Nov 10, 2021
Nov 10, 2021
Nov 10, 2021
Nov 10, 2021
Nov 10, 2021
Nov 10, 2021
Aug 13, 2021
Aug 5, 2021
Aug 5, 2021
Jun 4, 2021
Jun 4, 2021
May 31, 2021
May 24, 2021
May 24, 2021
May 24, 2021
May 21, 2021
May 21, 2021
May 21, 2021
Apr 29, 2021
Mar 22, 2021
Mar 18, 2021
Mar 18, 2021
Mar 18, 2021
Mar 18, 2021
Jan 4, 2021
Jan 4, 2021
Jan 4, 2021
Jan 4, 2021
Dec 16, 2020
Dec 4, 2020
Dec 4, 2020
Dec 4, 2020
Nov 27, 2020
Oct 22, 2020
Oct 13, 2020
Oct 13, 2020
Oct 13, 2020
Oct 13, 2020
Oct 13, 2020
Oct 13, 2020
Oct 13, 2020
May 23, 2014
Feb 27, 2014