1st Main Patent
Patent no.: CH432038
Tape recorder with continuous and/or selective playback of information, particularly
- Drawn up in German
- Applied to: Federal Office for Intellectual Property (IGE), Bern,
- Applicant: Standard
Telephon und Radio AG, Zurich
- Applied: 7 July 1964
- Granted: 15 March 1967
- Includes: 9 earlier patent
applications ("priority claims") for key Music Center
- Includes: 10 diagrams, all of which had been
originally registered with the DPA in Munich
The following table
shows nine priority
claims that Standard Telephon und Radio AG annexed to, and described in, the first main patent, to the Federal Office for Intellectual Property in Bern
on 7 July 1964 (see Summary).
||Title of Invention
||Track-selecting mechanism for tape recorders
||Track-selecting mechanism for tape recorders
||Track-selecting mechanism for magnetic tape recorders with wide
||Mechanism for adjusting the sound/ erase heads in tape
||Tape-run indicator for tape recorders
||Device for adjusting height/tilt of cabinet
||Cabinet for tape recorder and radio
||Magnetic tape recorder for the continuous and/or selective replaying
of information, particularly music
||Magnetic tape recorder with information starting in the middle of the
tape's length 
1. The service manuals for the Schaub-Lorenz Music Center
use the term "wide band".
2. This patent refers retrospectively to Friedrich
Knochenhauer's patent application no. DE1187823.
The patent family applications numbered 1-7 are patent registrations (Gebrauchmusteranmeldungen).
No.s 8-9 are registered, detailed descriptions of inventions (Auslegschriften).
It is not clear what the difference was between the first two priority claims in the table
On the basis of the nine priority claims,
the development team's key
- Track-selecting mechanism.
- Mechanism for adjusting the sound/erase heads.
- Tape-run indicator mechanism.
- Device for adjusting height/tilt of cabinet suspended on an I-framed
- Cabinet for housing tape recorder and radio.
- Method of recording information on multiple, parallel soundtracks on a
- Method of detecting the start/end of information/music recorded on a wide
- Mechanism for automatically switching to next track and rewinding
The following claims were made for this new
- A magnetic tape recorder with a wide tape fixed inside the recording device
that is enclosed in a cabinet.
- The tape contains multiple tracks on which information, particularly music,
can be recorded and played back either selectively or continuously.
- When selecting a track, a track-selecting mechanism locates the information
recorded on a particular track at a point corresponding to the beginning of the [ed. recordable]
- When the end of the [ed. recordable] tape is reached, the tape device
automatically rewinds the tape back to the beginning, and the playback head automatically switches (or can be
switched manually) to the next track.
The first main patent application CH432038 for
this tape recorder recognises a team of five co-inventors:
- Friedrich Knochenhauer
- Hans-Georg Fuchs
- Siegfried Apitz, Dipl.-Ing.
- Günter Löffler, Dipl.-Ing.
- Alexander Boom
Although only Siegfried Apitz and Günter Löffler are shown as having
the Diploma in Engineering qualification, research shows that all five of the team were in fact similarly qualified
with a Dipl.-Ing.
Unlike all its patent antecedents (see Priority claims), this first main patent application CH432038 was submitted
by Standard Telephon und
Radio AG  of Zurich whose correspondence address
was Gotthardhaus, Bubenbergplatz 11, Bern, Switzerland, and not by Standard Elektrik Lorenz AG of
Stuttgart-Zuffenhausen ), was made to the Federal Office for Intellectual Property
(IGE) , Einsteinstrasse 2, Bern, Switzerland, instead of to the usual
DPA  in Munich, as occurred with its nine priority claims. The reason for this choice is presumably because SEL had moved its registered office to
1. Standard Telephon und Radio
AG was International Telephone and Telegraph's (ITT) Swiss-based
telecommunications division. (ITT was founded in New York in 1920).
2. Standard Elektrik Lorenz AG was parent company ITT's German-based consumer
3. The IGE was renamed the Swiss Federal Institute of Intellectual Property in
4. DPA: Deutsche Patentamt, Zweibrückenstrasse 12, 8000 Munich 2,
The following ten diagrams (5 images):
- Were submitted together with patent CH432038
- Are the same as the individual drawings submitted with the
original nine priority
- Are listed chronologically in order of original application
- Are not in numerical order of the
- Indicate their respective priority claim numbers in brackets
Fig. 5: Track-selecting
mechanism (16155), showing heart-shaped disc cam.
Fig. 6: Track-selecting mechanism (16169).
7: Track-selecting mechanism (16171).
Fig. 8: Sound/erase head adjustment mechanism - from above
[record/play heads: 403; erase head: 404]
Sound/erase head adjustment mechanism - side view (16231).
Fig. 10: Tape-run indicator
4: Device for adjusting height/tilt of cabinet (16229), and I-framed pedestal.
Fig. 3: Cabinet for tape recorder and radio (16232) .
The patent describes all the attached drawings as 'examples' of how the tape-recorder
invention would look, adding a rider that they could deviate from the final design, which indeed they did, in
the following ways:
1. In Fig
2. In Fig
- It appears from the Dutch application for this main
patent (NL 6407513; pag. 11, lines 25-50 ), which is translated directly from the main German-Swiss
patent application (CH432038), that the inventors were planning a design for a cabinet that could be
rotated on its horizontal axis as shown in the figure
- It had two fixed, threaded shafts (not drawn)
protruding out from either side of the cabinet
- These two shafts would pass though a hole in two
moveable plates that could be slid up and down the vertical I-frame
- The cabinet and plate could then both be fastened
tightly to the I-frame using the two large threaded clamp-knobs  which wound around the threaded
shafts, enabling the user to adjust the cabinet's height above the floor and the angle of tilt, to optimise
ease of use and the acoustics
- As far as is known, this rotatable,
height-adjustable pedestal never went into production (please advise the website author if you know
- The I-framed pedestal [31, 32] with tiltable
cabinet, differs from the final production model, which consisted of a rectangular metal frame horizontally
mounted on four metal legs and fitted with four trolley wheels [a type known to the
The positions of the receiver (radio/receiver) , control
knobs  and tape-run indicator  in Fig. 3 all differ from the final production model (see main
Fig. 1: Information (on multiple,
parallel magnetic soundtracks) on a wide tape;
F. Knochenhauer (20910 IX).
Fig. 2: Information (on multiple,
parallel magnetic soundtracks), starting in middle
of a wide tape; an update of 20910 IX by A. Boom (21304 IX).
1. The correspondence associated with the patent family shows that the first seven
antecedent patent applications listed in the table above were sent from the
company's Pforzheim address in 1963.
2. Friedrich Knochenhauer
describes the tape-recorder invention for the first time in his earlier, antecedent patent application
3. Although registered as one of the five* co-inventors of the music center in the first main patent, Siegfried Apitz is the only inventor not cited as one of the inventors in any of its
nine antecedent patents which describe the key components of the
music center invention! This is odd as he was the most prolific of all the inventors (see
© Researched, translated and adapted by Peter
K. Smith, 26 June 2008