公开(公告)号：US11758332B1

公开(公告)日：2023-09-12

申请号：US17721571

申请日：2022-04-15

申请人： United States of America as represented by the Secretary of the Navy

发明人： Joshua M Kogot ,  April M Hirsch

IPC分类号： H04R9/08 ,  H04R9/02 ,  H04R9/04 ,  H04R1/04 ,  H04R31/00 ,  H04R7/04 ,  H01F7/02 ,  H01F7/08

CPC分类号： H04R9/08 ,  H01F7/02 ,  H01F7/081 ,  H04R1/04 ,  H04R7/04 ,  H04R9/025 ,  H04R9/045 ,  H04R31/003 ,  H04R2201/029 ,  H04R2307/021

摘要： A biodegradable microphone has a housing fabricated from a biodegradable ferromagnetic filament. The ferromagnetic filament is based on a biodegradable polymer having embedded magnetic materials. The housing has a body portion, an open first end and an opposite second end having a central opening. A permanent magnet is removably lodged within the central opening. The ferromagnetic filament and the magnet cooperate to produce a magnetic field within the housing interior. A biodegradable diaphragm is joined to the open first end of the housing. The diaphragm has an interior side facing the housing interior. A biodegradable coil is joined to the interior side and extends downward into the housing interior and is in proximity to the permanent magnet. Vibrations of the diaphragm cause a reciprocating motion of the coil within the magnetic field thereby inducing an electrical current in the coil.

公开(公告)号：US10934428B1

公开(公告)日：2021-03-02

申请号：US16850302

申请日：2020-04-16

申请人： United States of America as represented by the Secretary of the Navy

发明人： Joshua M Kogot ,  Matthew R Kincer ,  April Hirsch

IPC分类号： B33Y70/00 ,  C08L67/04 ,  C08L67/02 ,  C08L71/02 ,  C08L1/02 ,  C08K5/00 ,  C08L3/02 ,  C08L5/12 ,  C08L5/06 ,  C08L29/04 ,  B29L31/30

摘要： A composition is provided for producing a 3-D printable material comprised of a marine biodegradable base polymer and a gelling agent in a ratio preselected to achieve a desired rate of degradation of a structure printed from the material. Suitable polymers include polycaprolactone (PCL), polyhydroxyalkanoate (PHA), or polybutylene succinate (PBS). The gelling agent is typically agar. Faster rates of degradation of the structure are obtained with larger proportions of gelling agent in the composition. The composition may also include biological materials to further promote or control the biodegradation of the structure, and other additives such as nutrients for microorganisms or solidifying agents. 3-D printing of the material occurs at relatively lower temperatures to avoid damage to the biological materials.