Gerhard Ritzerfeld

Person

1000 Berlin 33, DT

People

Patents Grantslast 30 patents

Information Patent Grant
Programmed operation of rotary duplicator machine capable of whole-...
- Patent number 4,069,757
- Issue date Jan 24, 1978
- Gerhard Ritzerfeld
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
Information Patent Grant
Copying apparatus
- Patent number 4,068,948
- Issue date Jan 17, 1978
- Gerhard Ritzerfeld
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Copying apparatus
- Patent number 4,057,348
- Issue date Nov 8, 1977
- Gerhard Ritzerfeld
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Rotary printing machine
- Patent number 4,037,531
- Issue date Jul 26, 1977
- Gerhard Ritzerfeld
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
Information Patent Grant
Copier with means for handling components of form letters, and the...
- Patent number 4,029,413
- Issue date Jun 14, 1977
- Gerhard Ritzerfeld
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Electrostatic or xerographic copying or duplicating machine
- Patent number 4,026,646
- Issue date May 31, 1977
- Gerhard Ritzerfeld
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Electrostatic copier
- Patent number 4,009,954
- Issue date Mar 1, 1977
- Gerhard Ritzerfeld
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Electrostatic or xerographic copying or duplicating machine with bu...
- Patent number 4,009,956
- Issue date Mar 1, 1977
- Gerhard Ritzerfeld
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Rotary copying machine
- Patent number 4,002,117
- Issue date Jan 11, 1977
- Gerhard Ritzerfeld
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
Information Patent Grant
Rotary duplicating machine
- Patent number 3,995,546
- Issue date Dec 7, 1976
- Gerhard Ritzerfeld
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
Information Patent Grant
Copy sheet and method of printing the same
- Patent number 3,962,489
- Issue date Jun 8, 1976
- Gerhard Ritzerfeld
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
Information Patent Grant
Method of making a printing form
- Patent number 3,942,440
- Issue date Mar 9, 1976
- Gerhard Ritzerfeld
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS

Gerhard Ritzerfeld

Person

Patents Grantslast 30 patents

Programmed operation of rotary duplicator machine capable of whole-...

Copying apparatus

Copying apparatus

Rotary printing machine

Copier with means for handling components of form letters, and the...

Electrostatic or xerographic copying or duplicating machine

Electrostatic copier

Electrostatic or xerographic copying or duplicating machine with bu...

Rotary copying machine

Rotary duplicating machine

Copy sheet and method of printing the same

Method of making a printing form