79:" (German for "updates"). Between 1958 and 1975 around 40 percent of the original groups were replaced with groups from the emerging IPC. These new IPC-based parts mainly used the IPC group numbering, but kept the original DPK subclass symbols.
63:
The DPK was also used in Sweden, Norway, and other countries in
Scandinavia and central and eastern Europe. In the 1970s, development and active use of the system publications was discontinued as most of these countries switched to the
44:) started developing a classification system for its patent documents in 1877. It was greatly expanded during the following decades and was published in seven editions between 1906 and 1958, first as "
95:
65:
114:
21:
33:
8:
37:
98:
formerly the
Swedish Patent and Trademark Office (PRV), now at Internet Archive
108:
71:
Between the editions, modifications were published in the form of "
68:(IPC). The classification is still used on old patent documents.
96:
24:
system that was used in several
European countries.
106:
46:Verzeichnis der deutschen Patentklassen
107:
75:" (German for "modifications") and "
66:International Patent Classification
50:Gruppeneinteilung der Patentklassen
13:
14:
126:
89:
1:
82:
60:, is used in some databases.
58:Deutsche Patentklassifikation
18:German Patent Classification
7:
10:
131:
27:
115:Patent classifications
42:Kaiserliches Patentamt
77:Ergänzungslieferungen
22:patent classification
52:". The abbreviation
34:German Patent Office
122:
99:
93:
48:" and later as "
130:
129:
125:
124:
123:
121:
120:
119:
105:
104:
103:
102:
94:
90:
85:
30:
12:
11:
5:
128:
118:
117:
101:
100:
87:
86:
84:
81:
29:
26:
9:
6:
4:
3:
2:
127:
116:
113:
112:
110:
97:
92:
88:
80:
78:
74:
69:
67:
61:
59:
55:
51:
47:
43:
39:
35:
25:
23:
19:
91:
76:
72:
70:
62:
57:
53:
49:
45:
41:
31:
17:
15:
83:References
73:Ă„nderungen
109:Category
28:History
56:, for
38:German
20:is a
32:The
16:The
54:DPK
111::
40::
36:(
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