Using Derwent Classification to improve your subject searching - STN Example
Search Tips - July 2000
This is a search for patents on antilock braking systems (ABS) for cars and other vehicles which illustrates how Derwent Classes can be used to overcome the problem of ambiguous search terms. We begin with a keyword search, which yields more than fifteen thousand records. This is an unexpectedly high number, so the next step is to display a few records free-of-charge using the SCAN format. This will enable us to check what is being retrieved.
Begin searching in Derwent World Patent Index (Derwent WPI) (WPINDEX/WPIDS/WPIX)
=> file wpindex
In this word search, "w" means that the search terms are adjacent to each other in the specific order.
| => s abs or (antilock? or anti lock?)(w)brak? | ||
|
13579 2135 136172 283633 2662 116868 2987 15778 |
ABS ANTILOCK? ANTI LOCK? ANTI LOCK? (ANTI(W)LOCK?) BRAK? (ANTILOCK? OR ANTI LOCK?)(W)BRAK? ABS OR (ANTILOCK? OR ANTI LOCK?)(W)BRAK? |
|
| => d scan | ||
L1 15778 WPINDEX COPYRIGHT 2002 Derwent INFORMATION LTD
TI Tire arrangement for cars fitted with anti-lock-
brake-system in which rear tires have tread pattern
rigidity which is greater than that of front tires.
HOW MANY MORE ANSWERS DO YOU WISH TO SCAN? (1):4
L1 15778 WPINDEX COPYRIGHT 2002 Derwent INFORMATION LTD
TI Anti-lock braking system for a motor vehicle
sets period for which pressure rise signal is output
based on change in wheel rotation state at time of
peak wheel speed detection.
L1 15778 WPINDEX COPYRIGHT 2002 Derwent INFORMATION LTD
TI Catalyst for polymerization of conjugated diene
compounds.
L1 15778 WPINDEX COPYRIGHT 2002 Derwent INFORMATION LTD
TI Unsaturated polyether, used as polymer and cement
additive, and as prepolymer.
HOW MANY MORE ANSWERS DO YOU WISH TO SCAN? (1):0
|
Large numbers of irrelevant records are being retrieved. The problem is the search term "ABS", which must be included in the strategy. However, ABS can also be an abbreviation for acrylonitrile-butadiene-styrene polymer and an abbreviation for antibodies.
Our search could be refined by incorporating further keywords such as cars or vehicles, but this would probably be too restrictive. The best way to overcome the problem is to confine the search to Derwent Class Q18 - Vehicle Brake Control Systems.
| => s l1 and q18/dc | ||
L2 |
31370 3187 |
Q18/DC L1 AND Q18/DC |
Display a few of the records in an inexpensive format:
[for more details on display formats see Useful
formats for Derent WPI]
=> d ti tri 2-5
L2 ANSWER 2 OF 3187 WPINDEX COPYRIGHT 2002 Derwent INFORMATION LTD
TI Antilock brake system for motor vehicle, judges
failure frequency which is lower for vehicle without parking
brake compared to vehicle with parking brake.
AN 2000-394270 [34] WPINDEX
DNN N2000-296136
TT TT: ANTILOCK BRAKE SYSTEM MOTOR VEHICLE JUDGEMENT FAIL
FREQUENCY LOWER VEHICLE PARK BRAKE COMPARE VEHICLE PARK BRAKE.
DC Q18 X22
IC ICM B60T008-88
MC EPI: X22-C02C3
PNC 1
CYC 1
L2 ANSWER 3 OF 3187 WPINDEX COPYRIGHT 2002 Derwent INFORMATION LTD
TI Vehicle braking system for controlling speed of electrohydraulic
braking comprises accumulator and replenished by pumping
additional working fluid.
AN 2000-389151 [34] WPINDEX
DNN N2000-291402
TT TT: VEHICLE BRAKE SYSTEM CONTROL SPEED ELECTROHYDRAULIC BRAKE
COMPRISE ACCUMULATOR REPLENISH PUMP ADD WORK FLUID.
DC Q18 X22
IC ICM B60T008-40
ICA B60T013-14
ICI B60T101:00, B60T103:00
MC EPI: X22-C02C
PNC 2
CYC 25
L2 ANSWER 4 OF 3187 WPINDEX COPYRIGHT 2002 Derwent INFORMATION LTD
TI Integrated ABS, traction control, vehicle stability control,
braking system with a separate boost valve has boost valve
actuated by a single solenoid.
AN 2000-386331 [33] WPINDEX
DNN N2000-289154
TT TT: INTEGRATE TRACTION CONTROL VEHICLE STABILISED CONTROL BRAKE
SYSTEM SEPARATE BOOST VALVE BOOST VALVE ACTUATE SINGLE
SOLENOID.
DC Q18 X22
IC ICM B60T008-34
MC EPI: X22-C02C; X22-C02C1; X22-C02C3
PNC 1
CYC 1
L2 ANSWER 5 OF 3187 WPINDEX COPYRIGHT 2002 Derwent INFORMATION LTD
TI Auxiliary brake mechanism for ABS in vehicle, uses treading
force information to judge shearing stress on brake pedal arm so
that based on applied braking force, auxiliary braking force is
generated.
AN 2000-381465 [33] WPINDEX
DNN N2000-286846
TT TT: AUXILIARY BRAKE MECHANISM VEHICLE TREAD FORCE INFORMATION
JUDGEMENT SHEAR STRESS BRAKE PEDAL ARM SO BASED APPLY BRAKE
FORCE AUXILIARY BRAKE FORCE GENERATE.
DC Q18
IC ICM B60T013-74
PNC 1
CYC 1
|
This is a good result - but can we do better? We can use STN's ANALYSE command to find out which Derwent Classifications appear most frequently in this set of records. All you need to do is to type in ANALYSE, and STN will come back with a number of prompts. If you wish to confirm STN's recommendations, just type in ".", i.e. (full stop/period), otherwise type in your own option.
=> analyse ENTER ANSWER SET OR ANALYZE L# OR (L2):. ENTER ANSWER NUMBER OR RANGE (1-):. ENTER DISPLAY CODE (TI) OR ?:dc ANALYZE IS APPROXIMATELY 25% COMPLETE
ANALYZE IS APPROXIMATELY 30% COMPLETE
ANALYZE IS APPROXIMATELY 52% COMPLETE
ANALYZE IS APPROXIMATELY 59% COMPLETE
ANALYZE IS APPROXIMATELY 79% COMPLETE
ANALYZE IS APPROXIMATELY 85% COMPLETE
L3 ANALYZE L2 1- DC : 93 TERMS
Display the result of our analysis:
=> d
L3 ANALYZE L2 1- DC : 93 TERMS
TERM # # OCC # DOC % DOC DC
------ ------- ------ ------ ---------------
1 3187 3187 100.00 Q18
2 2497 2497 78.35 X22
3 388 388 12.17 S02
4 366 366 11.48 Q13
5 145 145 4.55 T01
6 117 117 3.67 Q66
7 113 113 3.55 Q57
8 90 90 2.82 Q17
9 90 90 2.82 T06
10 77 77 2.42 V06
From the result of our analysis we can see that X22 (Automotive Electrics) comes in second place. We can therefore bring X22 into our search as well. As can be seen in answer set "L4", we have considerably improved our search result by using both Derwent Classes.
=> s l1 and (q18 or x22)/dc
31370 Q18/DC
187292 X22/DC
L4 4132 L1 AND (Q18 OR X22)/DC
=> d ti tri 13-15
L4 ANSWER 13 OF 4132 WPINDEX COPYRIGHT 2002 Derwent INFORMATION LTD
TI Solenoid-controlled valve, e.g. for antilock braking
system, has two valves with opening/closing modes varied in number
of steps according to displacement of movable part.
AN 2000-367144 [32] WPINDEX
CR 2000-334058 [29]
DNN N2000-274709
TT TT: SOLENOID CONTROL VALVE ANTILOCK BRAKE SYSTEM TWO
VALVE OPEN CLOSE MODE VARY NUMBER STEP ACCORD DISPLACEMENT
MOVE PART.
DC Q18 Q57 Q66 X22
IC ICM F16K031-06
ICS B60T008-36; B60T013-68; F15B013-044
MC EPI: X22-C02C3
PNC 1
CYC 1
L4 ANSWER 14 OF 4132 WPINDEX COPYRIGHT 2002 Derwent INFORMATION LTD
TI Anti-lock braking system brake operation
monitoring apparatus and method based on calculating wheel speed
differentials and electronic control unit.
AN 2000-364823 [31] WPINDEX
DNN N2000-273046
TT TT: ANTI LOCK BRAKE SYSTEM BRAKE OPERATE
MONITOR APPARATUS METHOD BASED CALCULATE WHEEL SPEED
DIFFERENTIAL ELECTRONIC CONTROL UNIT.
DC Q18 X22
IC ICM B60T008-88
MC EPI: X22-C02C3; X22-X06A
PNC 1
CYC 23
L4 ANSWER 15 OF 4132 WPINDEX COPYRIGHT 2002 Derwent INFORMATION LTD
TI Mechanical anti-lock braking system for
bicycle wheel comprises gyrating bodies and inclined actinic slip
rings with brake pad mechanically connected to upper inclined
actinic slip ring.
AN 2000-364529 [31] WPINDEX
DNN N2000-272786
TT TT: MECHANICAL ANTI LOCK BRAKE SYSTEM
BICYCLE WHEEL COMPRISE GYRATORY BODY INCLINE ACTINIC SLIP RING
BRAKE PAD MECHANICAL CONNECT UPPER INCLINE ACTINIC SLIP RING.
DC Q18 Q23
IC ICM B62L001-00
ICS B60T008-32; B60T008-54; B60T008-74
PNC 1
CYC 83
|
Analysing Derwent Classifications is also a useful way of identifying a company's key activities. We will be looking at this in further detail in a Search Tip later this year.
For further assistance please contact your local Derwent Help Desk.