Questel has created 27 event groups which regroup similar actions from the different patent offices:

Code
Definition of the code
Comment
ACL
Accelerated Prosecutions

ADM
Administrative notifications

APL
Applicant appeals and petitions

CCL
Classification amendments

COR
Corrections, amendments

CPA
Continued Prosecution Application (US only)
US only
DCS
Designated contracting states (WO and EP)
WO and EP
ENP
Entry into national phase, translations (AP, EA, EP, OA, WO)

EXM
Requests for examination, review procedures and review process, research reports
Need to combine with STATUS/ACT=PENDING P (event group)
INT
Examiner Interview (US only)
US Only
LAVL
For patents declared available for licensing or sale

LIC
License event (licensed or candidate patents)
General category for any event related to licensing
NLAV
Willingness to license withdrawn, revoked
Opposite of LAVL
NENP
Nonentry into national phase (WO and EP)
WO and EP
NIF
Not in force due to patent or application lapsed, expired, surrendered, withdrawn, abandoned, refusal, rejection, abandoned, etc.
Only for dead patents (LAPSED, REVOKED, EXPIRED)
NMC
Change of party name (applicant, assignee, inventor, opponent) or address

NOPP
No opposition filed
Only present if we get a specific event that the legal period for file 3rd party oppositions has passed.    
OA
Official Office Action (final rejection, nonfinal rejection, Quayle Action, Vacate 2nd Off. Action (US only)
US only, customized for use by Orbit analysis
OAI
Applicant (incoming) initiated action or response to an office action or office communication (US only)
US only
OAO
Office action or office communication Outgoing (US only)
US only
OPP
Opposition, reexaminations, requested by 3rd parties
Does not include applicant appeals
PAY
Fee payment events
These events will be sorted in ACT based on effective date EFFD, not action date AD.
PIF
Patent in force
Combine with STATUS/ACT=GRANTED P (event code)
RAS
Reassignment, transfer of rights
Triggers breakout field REAS
RCE
Request for Continued Examination (US only)
US Only
RES
Restitution, restoration: in effect

SPC
Actions concerning complementary or supplementary certificates of protection, extension of protection period.


These Event groups are searchable in combination with the legal status described here or with other search criteria. To learn more about the syntax in the /ACT field, please refer to the article "Understand the events groups in the Legal status". 

Warning: the AND operator will search inside the family, not only within one member. You can use the P operator instead to narrow down within an application legal status.


Example of search:

FR patents (national procedure or EP / PCT) having an extension on the term of protection (SPC)

EG/ACT=SPC P (PC/ACT=FR OR CC/ACT=FR)

The paragraph operator P is used to specify that the patents retrieved with an extension of term (SPC) are FR patents.


Patent offices or countries also form part of the ACT index. You have two possibilities to search for countries; either PC/ACT which is country of publication or CC/ACT which is a designated state on a PCT or EP application.


Please refer to the FamPat factsheet for Orbit to see a listing of searchable fields and details regarding syntax.