# The Discovery of Lovastatin for Lowering Cholesterol

> A 1979 patent by Merck describing the isolation of a fermentation product from Aspergillus fungi that effectively lowers cholesterol levels in the blood.

- **Patent:** US 4231938
- **Original title:** Hypocholesteremic fermentation products and process of preparation
- **Owner:** Merck and Co Inc
- **Granted:** 1980
- **Status:** Public domain (expired)
- **Times cited:** 490
- **Field:** biotech, pharmaceutical

## What it does

The patent details the isolation of a specific compound, initially designated MSD803, produced by fermenting the fungus Aspergillus. This compound, later known as lovastatin, functions as a potent inhibitor of cholesterol synthesis in the human body. The claims specifically protect the chemical structure of this lactone compound and its corresponding hydroxy acid form, which are used to treat high cholesterol and lipid levels.

## What it does NOT cover

- Does not cover synthetic statins developed later that share different chemical backbones.
- Does not cover the general process of fermentation for non-cholesterol-lowering compounds.
- Does not cover the use of the compound for treating conditions unrelated to cholesterol or lipid metabolism.

## The clever bit

The innovation was identifying that a natural byproduct of a common fungus could act as a precise 'off switch' for the enzyme HMG-CoA reductase, which is the rate-limiting step in human cholesterol production.

## Real-world examples

1. Mevacor
2. Generic lovastatin medications

## Why it matters

This patent marks the birth of the statin class of drugs, which became one of the most commercially successful and medically significant pharmaceutical categories in history. It provided a biological solution to heart disease by targeting the body's natural cholesterol production mechanism, fundamentally changing how doctors manage cardiovascular health.

## Frequently asked questions

### What does The Discovery of Lovastatin for Lowering Cholesterol cover?

A 1979 patent by Merck describing the isolation of a fermentation product from Aspergillus fungi that effectively lowers cholesterol levels in the blood.

### Who owns patent US 4231938?

Merck and Co Inc owns this patent, granted in 1980.

### When does this patent expire?

This patent has expired and is now in the public domain — anyone can use the invention freely.

### What is patent US 4231938 cited by?

This patent has been cited by 490 later patents that build on its ideas.

### What problem does this patent solve?

This patent marks the birth of the statin class of drugs, which became one of the most commercially successful and medically significant pharmaceutical categories in history. It provided a biological solution to heart disease by targeting the body's natural cholesterol production mechanism, fundamentally changing how doctors manage cardiovascular health.

### What does this patent NOT cover?

Does not cover synthetic statins developed later that share different chemical backbones.

**Full plain-English explainer:** https://patentbrief.org/patent/us/4231938/statin-cholesterol-lovastatin

**Original patent:** https://patents.google.com/patent/US4231938

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


## Related patents

Semantically similar inventions in the PatentBrief corpus:

- [The Discovery of Aspartame as a Sugar Substitute](https://patentbrief.org/patent/us/3492131/aspartame-sweetener) — This 1966 patent identifies specific chemical compounds, known as aspartylphenylalanine esters, that provide intense sweetness for food and drinks without using sugar.
- [The Chemical Discovery Behind the First Oral Contraceptive Pill](https://patentbrief.org/patent/us/2744122/birth-control-pill-norethindrone) — A 1952 patent for a synthetic hormone that became the active ingredient in the first effective oral contraceptive pill.
- [How Scientists Taught Bacteria to Make Human Hormones](https://patentbrief.org/patent/us/4356270/recombinant-dna-cloning-genentech) — Genentech's 1979 patent on using engineered DNA to force bacteria to produce human proteins like insulin and growth hormones.
- [How Scientists Created Bacteria That Eat Oil Spills](https://patentbrief.org/patent/us/4259444/chakrabarty-genetically-modified-bacteria) — A 1981 patent for genetically engineered bacteria capable of breaking down multiple types of oil, which became the first living organism ever patented.
- [Using Specific Steroid Molecules to Block Salt Retention in the Body](https://patentbrief.org/patent/us/4081538/aldosterone-antagonists) — A 1976 medical patent describing the use of 11-beta,18-oxidopregnane compounds to help the body excrete sodium by blocking the salt-retaining effects of the hormone aldosterone.