HP LaserJet 1300 - Manual (Page 57)

ENWW Storing print cartridges 49
Storing print cartridges
Do not remove the print cartridge from its package until you are ready to use it. The shelf life of a
print cartridge in an unopened package is approximately 2.5 years. The shelf life of a print
cartridge in an opened package is approximately 6 months.
CAUTION To prevent damage to the print cartridge, minimize its exposure to direct light.