You can freely build on How Cable Boxes Download Software Updates Remotely
This patent expired in 2014. Every claim — 0 independent, 0 dependent — is now unenforceable. Anyone can use, reproduce, manufacture, sell, or offer for sale this technology without a license.
Original assignee
Scientific Atlanta LLC
Patent granted
1995
Expired
2014
Forward citations
249
What this patent covers
This patent describes a system where a cable box uses a permanent, unchangeable piece of software called a boot program to manage updates. When the cable provider sends a signal, the boot program reads the instructions, which include which TV channel the update is hiding on and where in the box's memory to save it. Once the box receives all the pieces of the new software, the boot program installs them and restarts the box with the new features active. This allows cable companies to fix bugs or add new menu features to millions of boxes without a technician visiting the home.
What is now free to use
All 0 claims of US 5440632 are in the public domain. Specifically:
The 0 dependent claims add narrowing limitations and are also free.
What is NOT covered
Patent expiry frees this specific invention. Separately-patented improvements made after expiry may still be protected.
Does not cover updates performed via physical connections like USB or Ethernet cables.
Does not cover systems that require a user to manually trigger the update process.
Does not cover software updates for devices that are not part of a subscription television system.
Who is building on this today
Scientific Atlanta was acquired by Cisco, and much of this technology is now standard practice across the cable and telecommunications industry. Major infrastructure providers like CommScope and various smart home device manufacturers continue to use similar bootloader architectures to manage remote device updates.
Products built on expired version of this technology
Cable set-top boxes from providers like Comcast or Spectrum
Early digital satellite receivers
Firmware update mechanisms for embedded consumer electronics
How to cite this patent in your documentation
Scientific Atlanta LLC. US Patent 5440632. Reprogrammable subscriber terminal. Granted 1995, expired 2014. Now in the public domain.
Note: This is a convenience citation. Consult a patent attorney for formal freedom-to-operate analysis.
PatentBrief is an educational resource and does not provide legal advice. Patent expiration information is derived from USPTO records and may not reflect continuation patents, divisional filings, or separately-patented improvements. For commercial use or production decisions, obtain a formal freedom-to-operate (FTO) opinion from a registered patent attorney.