# How Spacecraft Servicing Pods Maneuver and Refuel Other Satellites

> A specialized robotic pod designed to dock with aging satellites and use a flexible, multi-jointed boom arm to adjust their orbit or velocity.

- **Patent:** US 11685554
- **Original title:** Spacecraft servicing devices and related assemblies, systems, and methods
- **Owner:** Northrop Grumman Systems Corp
- **Granted:** 2023
- **Status:** Active
- **Times cited:** 2
- **Field:** aerospace, mechanical, telecommunications

## What it does

This patent describes a small, deployable spacecraft 'servicing device' that acts as a life-extension kit for satellites. The device features a rotatable boom arm with a thruster assembly at the end, which allows it to precisely position engines to push or steer a target satellite. By placing the boom arm's pivot point near the docking mechanism, the device can maintain a stable connection while moving its thrusters to different angles. This allows the servicer to perform orbital corrections or station-keeping maneuvers on a target satellite that has run out of its own fuel.

## What it does NOT cover

- Does not cover autonomous docking systems that lack a movable boom arm for thruster positioning
- Does not cover servicing devices that are permanently integrated into the host spacecraft rather than being deployable pods
- Does not cover non-mechanical methods of orbital adjustment, such as solar sails or electromagnetic tethers
- Does not cover the internal chemical composition of the thruster fuel itself

## The clever bit

The innovation lies in the placement of the boom arm's rotatable coupling directly adjacent to the docking feature, which allows the thruster to exert force on the target satellite from multiple orientations without needing to move the entire docking assembly.

## Real-world examples

1. Northrop Grumman Mission Extension Vehicle (MEV)
2. Satellite life-extension service missions
3. On-orbit robotic maintenance platforms

## Why it matters

As satellites become expensive, long-term assets, the ability to extend their operational life is critical for commercial and military space operations. This technology enables 'in-orbit servicing,' which could prevent the accumulation of space debris by keeping functional satellites in their correct orbits rather than letting them drift or burn up prematurely.

## Frequently asked questions

### What does How Spacecraft Servicing Pods Maneuver and Refuel Other Satellites cover?

A specialized robotic pod designed to dock with aging satellites and use a flexible, multi-jointed boom arm to adjust their orbit or velocity.

### Who owns patent US 11685554?

Northrop Grumman Systems Corp owns this patent, granted in 2023.

### When does this patent expire?

This patent is expected to expire on June 27, 2043, when the invention enters the public domain.

### What is patent US 11685554 cited by?

This patent has been cited by 2 later patents that build on its ideas.

### What problem does this patent solve?

As satellites become expensive, long-term assets, the ability to extend their operational life is critical for commercial and military space operations. This technology enables 'in-orbit servicing,' which could prevent the accumulation of space debris by keeping functional satellites in their correct orbits rather than letting them drift or burn up prematurely.

### What does this patent NOT cover?

Does not cover autonomous docking systems that lack a movable boom arm for thruster positioning

**Full plain-English explainer:** https://patentbrief.org/patent/us/11685554/starship-upper-stage

**Original patent:** https://patents.google.com/patent/US11685554

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_Source: PatentBrief — https://patentbrief.org. Patent facts are from public records; the plain-English explanation is PatentBrief's._