# A Rotating Space Station for Catching and Launching Cargo

> A patent for a rotating space station that uses long, extendable cables to catch and release cargo payloads while orbiting a planet.

- **Patent:** US 7503526
- **Original title:** Space transportation node including tether system
- **Owner:** Individual
- **Granted:** 2009
- **Status:** Public domain (expired)
- **Times cited:** 18
- **Field:** aerospace, mechanical

## What it does

The system features a large, rotating truss structure that orbits a celestial body, such as Earth. At each end of this truss, a tether tip is attached via a cable that can be reeled in or out. This allows the station to act like a spinning arm, where the tether tips extend to grab or release payloads—like fuel tanks or cargo—while the station continues its rotation. The system also includes mechanisms to adjust its center of mass and even repair itself if a tether cable snaps, using distributed sub-nodes that can maneuver to fix the break.

## What it does NOT cover

- Does not cover stationary space stations that do not utilize rotating tethers for payload transfer.
- Does not cover general satellite deployment methods that do not involve the specific truss and tether reel mechanism described.
- Does not cover ground-based launch systems that operate independently of the orbiting tether node.

## The clever bit

The system treats the entire rotating truss as a dynamic balance scale, actively shifting internal mass to change its center of gravity, which allows it to compensate for orbital forces or the irregular shape of a planet.

## Real-world examples

1. Conceptual orbital fuel depots
2. Space tether momentum exchange systems
3. Proposed orbital cargo transfer stations

## Why it matters

This patent represents a conceptual approach to 'orbital infrastructure,' aiming to reduce the fuel costs of space travel by using momentum exchange. Instead of every spacecraft carrying its own fuel for every maneuver, this system proposes a 'gas station' in orbit that can physically catch and toss cargo to different trajectories. It reflects the early 2000s interest in repurposing Space Shuttle external tanks for permanent orbital structures.

## Frequently asked questions

### What does A Rotating Space Station for Catching and Launching Cargo cover?

A patent for a rotating space station that uses long, extendable cables to catch and release cargo payloads while orbiting a planet.

### Who owns patent US 7503526?

Individual owns this patent, granted in 2009.

### When does this patent expire?

This patent is expected to expire on March 17, 2029, when the invention enters the public domain.

### What is patent US 7503526 cited by?

This patent has been cited by 18 later patents that build on its ideas.

### What problem does this patent solve?

This patent represents a conceptual approach to 'orbital infrastructure,' aiming to reduce the fuel costs of space travel by using momentum exchange. Instead of every spacecraft carrying its own fuel for every maneuver, this system proposes a 'gas station' in orbit that can physically catch and toss cargo to different trajectories. It reflects the early 2000s interest in repurposing Space Shuttle external tanks for permanent orbital structures.

### What does this patent NOT cover?

Does not cover stationary space stations that do not utilize rotating tethers for payload transfer.

**Full plain-English explainer:** https://patentbrief.org/patent/us/7503526/supersonic-retropropulsion

**Original patent:** https://patents.google.com/patent/US7503526

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