Protocol Engineering Limited
Hertfordshire, GB· latest recorded location
Protocol Engineering Limited is named on 5 US grants and 0 published applications in this corpus. Its most frequent classification is G03F (Photomechanical production of textured or patterned surfaces).
- Granted patents
- 5
- Published applications
- 0
- Inventors
- 5
- Granted in 2026 so far
- 0
- Most recent grant
- 30 Apr 1991
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
By publication year.
Technology areas
Share of 5 documents
- G03FPhotomechanical production of textured or patterned surfaces3
- Y10TTechnical subjects covered by former us classification3
- G03BApparatus or arrangements for taking photographs or for projecting or viewing them2
- B26FPerforating1
- B41FPrinting machines or presses1
- B44BMachines, apparatus or tools for artistic work1
- G05BControl or regulating systems in general1
Recent patents
- Film registration apparatus and method30 Apr 1991US 5,012,345 A
- Apparatus for producing a line of separation in a plastic work surface10 Jun 1986US 4,594,499 A
- Making of printing plates14 May 1985US 4,517,036 A
- Film punch registration26 Apr 1983US 4,380,946 A
- Mounting of flexible printing plates26 Apr 1983US 4,380,956 A
No published applications.
Most cited
By later US patents