|
Date |
Patent Name |
Improvement |
Inventor |
| 1857 |
Pianoforte-Action |
Smooth repetitive key action. |
Henry Steinway, Jr. |
| 1858 |
Pianoforte-Action |
Repetition improvement upon the earlier patent. |
Henry Steinway, Jr |
| 1859 |
Pianoforte |
Improved securing and positioning of agraffes. |
Henry Steinway, Jr |
| 1859 |
Grand Piano |
Overstringing layout for the grand piano. |
Henry Steinway, Jr |
| 1861 |
Pianoforte-Action |
Further improvement on repetition and hammer escape. |
Henry Steinway, Jr |
| 1861 |
Pianoforte-Action |
Further improvement on repetition. |
Henry Steinway, Jr |
| 1862 |
Improvement in Piano-Forte Actions |
Reworded earlier patents with additional illustrations. |
Henry Steinway, Jr |
| 1862 |
Improvement in Piano-Forte Actions |
Further improvement on repetition and other factors. |
Henry Steinway, Jr |
| 1866 |
Improvement in Piano-Fortes |
Introduction of a single cast-iron plate for uprights. |
William Steinway |
| 1868 |
Improvement in Piano-Fortes |
Improvements on securing the pin-block. |
C.F. Theodor Steinway |
| 1869 |
Improvement in Sound-Boards for Piano-Fortes |
Addition of dowels to the bridge. |
C.F. Theodor Steinway |
| 1869 |
Improvement in Piano-Forte Actions |
Adaption of 1868 patent to grands. |
C.F. Theodor Steinway |
| 1869 |
Improvement in Piano-Fortes |
Improvement of one piece cast-iron plate on grands. |
C.F. Theodor Steinway |
| 1871 |
Improvement in Piano-Actions |
Improvement on key movement. |
C.F. Theodor Steinway |
| 1872 |
Improvement in Duplex Agraffe Scales for Piano-Fortes |
Improvement of agraffe scales. |
C.F. Theodor Steinway |
| 1872 |
Improvement in Piano-Fortes |
Improvement of plate for grands. |
C.F. Theodor Steinway |
| 1872 |
Improvement in Piano-Fortes |
Improvement of plate for uprights. |
C.F. Theodor Steinway |
| 1873 |
Improvement in Piano Sounding- Boards |
Reinforced soundboard. |
C.F. Theodor Steinway |
| 1874 |
Improvement in Piano-Forte Attachments |
Addition of sostenuto mechanism. |
Albert Steinway |
|
Sources (Click to Expand/Collapse)
Ratcliffe, Ronald and Stuart Isacoff. Steinway. San Francisco: Chronicle Books, 2002.
