Where does Amphastar Pharmaceuticals, Inc. rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), Amphastar Pharmaceuticals, Inc. ranks #18,376 of 49,997 assignees by granted-patent volume, the same sort as the companies listing and top-holders ranking. See /methodology/#corpus-placement.

How many patents does Amphastar Pharmaceuticals, Inc. hold?

Amphastar Pharmaceuticals, Inc. holds 15 US utility patents granted between 2015 and 2025, spanning 14 technology areas.

What is Amphastar Pharmaceuticals, Inc.'s Innovation Score?

Amphastar Pharmaceuticals, Inc. has an Innovation Score of 40.4 out of 100 (top 36% of the corpus). This composite metric weighs portfolio volume (40%), grant velocity (20%), technology breadth (25%), and claim depth (15%).

What technology areas does Amphastar Pharmaceuticals, Inc. focus on?

Amphastar Pharmaceuticals, Inc.'s top technology area is A61K (Preparations FOR Medical, Dental OR Toiletry Purposes) with 10 patents, ranking #2,196 of 7,163 assignees active in that subclass. Grants appear in 14 CPC subclasses total.

Is Amphastar Pharmaceuticals, Inc.'s patent grant rate increasing or decreasing?

Amphastar Pharmaceuticals, Inc.'s recent grant velocity is -50% compared to the prior five-year period (grant years, not application filing dates). Grant activity has slowed relative to earlier years.

What does claim depth mean for Amphastar Pharmaceuticals, Inc.'s patents?

Amphastar Pharmaceuticals, Inc.'s patents average 18.3 claims each. This is an aggregate descriptive count from the grant record; it does not establish claim scope, legal strength, enforceability, or design-around risk.

How is the Amphastar Pharmaceuticals, Inc. patent data sourced?

All patent data comes from USPTO PatentsView, a public research dataset maintained by the United States Patent and Trademark Office covering US granted utility patents from 2015 to 2025.

USPTO 2015–2025 USPTO PatentsView US Corporation

Amphastar Pharmaceuticals, Inc.

USPTO PatentsView assignee record - 15 granted patents across 14 technology areas, recorded in grant years 2015–2025. Grant-trend analysis is cross-referenced to USPTO Patent Public Search; it does not measure application filings, current R&D, or legal strength. Primary class: A61K (Preparations FOR Medical, Dental OR Toiletry Purposes).

Compiled by PlainPatent · May 15, 2026

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The verdict

According to USPTO PatentsView, Amphastar ranks #18,376 of 49,997 tracked US assignees by granted-patent volume, with 15 patents across 14 technology areas.

#18,376
of 49,997 US assignees by volume: Top 36%
by Innovation Score (40.4/100): 18.3
avg claims per patent: -50%
grant velocity, last 5 yrs

USPTO PatentsView assignee plate

Corpus R18376 · US Corporation #18,376 · 15 grants

GRANTS-MICRO · MID-PACK · PHOTO-FINISH · CPC-FOCUS · INNOV-PAR · CLAIMS-RICH · TYPE-USCORP · VEL-DROP · BOOK-FULL

GRANTS-MICRO 15 grants
MID-PACK #18,376/49,997
PHOTO-FINISH Alma Lasers
CPC-FOCUS A61K · 14 areas
INNOV-PAR 40.4/100
CLAIMS-RICH 18.3 claims/avg
TYPE-USCORP US Corporation
VEL-DROP -50% vel
BOOK-FULL 10/10 fields

Nearest grant-volume peer: Alma Lasers Ltd. (±0 grants)

Instrument codes from this assignee’s USPTO PatentsView grant sheet: volume band, corpus rank, photo-finish peer, lead CPC, Innovation Score, claim depth, assignee type, velocity, and book completeness. Not a USPTO rating of patent strength.

How Amphastar’s 40.4 Innovation Score adds up

The same four weighted components behind every Innovation Score on PlainPatent: portfolio volume, grant velocity, technology breadth, and claim depth.

Volume 9.6 pts (24%) Velocity 6.7 pts (17%) Breadth 13.2 pts (33%) Claim depth 11.0 pts (27%)

Qualcomm Incorporated · highest

85
Amphastar Pharmaceut… · this assignee

40
3D Lighting… · lowest

7

What this shows Amphastar's Innovation Score is 40.4/100 (top 36% of the PatentsView-derived corpus). The chart places that score against the nearest Innovation Score peers plus corpus poles, not a reprint of the volume ranking.

Does more volume mean deeper claims for Amphastar?

Each dot is one of Amphastar’s 8 nearest volume peers (same corpus rank neighbourhood as the chart above), placed by total granted patents (horizontal) against average claims per patent (vertical). Amphastar’s own 18.3 claims/patent is ABOVE the 13.3 median for these volume peers. More thorough claims than most filers at this scale, not just more of them.

Amphastar vs its 8 nearest volume peers: granted patents vs average claims per patent. Source: USPTO PatentsView.

Where Amphastar's grants concentrate

Amphastar Pharmaceuticals, Inc. is a focused PatentsView assignee: 14 CPC subclasses with 66.7% of grants classified under A61K (Preparations FOR Medical, Dental OR Toiletry Purposes). Peak complete grant year is 2019 (4 grants) versus a trough of 1 in 2015. By volume, Amphastar sits between Alma Lasers Ltd. and Ao Jie Plastic Toys Factory Ltd..

Amphastar's three-year grant acceleration

Amphastar Pharmaceuticals, Inc. shows 4 grants in 2022–2024 against only 4 in 2019–2021. That prior window is too thin for a growth multiple (rename and spin-out assignees look artificially high when the baseline is near zero), so PlainPatent withholds a ranked acceleration claim here.

Alma Lasers

15
Alumend

15
American Nano

15
American Panel

15
Analiza

15
Andong National U…

15
Antsy Labs

15
Ao Jie Plastic To…

15
Amphastar Pharmac… ◀

15

What this shows Amphastar holds 15 patents at rank #18,401, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near Amphastar

By rank, the assignees closest to #18,401 in granted patent volume.

Leaders in A61K (Preparations FOR Medical)

Other assignees with the most granted patents in Amphastar's primary technology class.

Amphastar's Innovation Score vs. every tracked assignee

Composite of portfolio volume, grant velocity, technology breadth, and claim depth (0–100)

40 Top 36% higher than 64% of 49,997 US assignees

Each bar is a band; taller bars hold more US assignees. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source USPTO PatentsView, PlainPatent Innovation Score · 2015–2025

USPTO utility patent grants by year · 2015–2025

Grants by year

Teal-shaded recent years (2020–present) versus the 2015–2019 baseline. Full figures in the table below.

View data table

Amphastar Pharmaceuticals, Inc. patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2015	1	6.7%
2016	2	13.3%
2018	1	6.7%
2019	4	26.7%
2022	2	13.3%
2023	1	6.7%
2024	1	6.7%
2025partial year	3	20.0%

Which technologies does Amphastar Pharmaceuticals, Inc. patent most?

A61K - Preparations FOR Medical, Dental OR Toiletry Purposes 10

A61P - Specific Therapeutic Activity OF Chemical Compounds OR Medicinal Preparations 8

C07K - Peptides 5

A61M - Devices FOR Introducing Media Into, OR Onto, THE Body ; Devices FOR Transducing Body Media OR FOR Taking Media From THE Body ; Devices FOR Producing OR Ending Sleep OR Stupor 3

C07D - Heterocyclic Compounds 2

C07H - SUGARS; Derivatives THEREOF; NUCLEOSIDES; NUCLEOTIDES; Nucleic Acids 1

G09B - Educational OR Demonstration APPLIANCES; Appliances FOR Teaching, OR Communicating With, THE Blind, Deaf OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; Diagrams 1

B05B - Spraying APPARATUS; Atomising APPARATUS; Nozzles 1

A61J - Containers Specially Adapted FOR Medical OR Pharmaceutical PURPOSES; Devices OR Methods Specially Adapted FOR Bringing Pharmaceutical Products Into Particular Physical OR Administering FORMS; Devices FOR Administering Food OR Medicines ORALLY; Baby COMFORTERS; Devices FOR Receiving Spittle 1

C07C - Acyclic OR Carbocyclic Compounds 1

C07B - General Methods OF Organic CHEMISTRY; Apparatus Therefor 1

B01D - Separation 1

G01N - Investigating OR Analysing Materials BY Determining Their Chemical OR Physical Properties 1

C07J - Steroids 1

Top 14 of 14 technology areas

More on this record

Data Source

USPTO PatentsView, US granted patents 2015–2025

View all rankings → How is Innovation Score calculated?

What to do with this data

Amphastar Pharmaceuticals, Inc.'s patent record in context - here's where to go next.

Amphastar Pharmaceuticals, Inc.'s lead technology class is A61K (Preparations FOR Medical, Dental OR Toiletry Purposes), 66.7% of its portfolio - see every assignee active in that class. Explore A61K
Ranked #18,376 of 49,997 tracked assignees by patent volume - see the full leaderboard. See the ranking
Compare Amphastar Pharmaceuticals, Inc. against Alma Lasers Ltd., an assignee filing at a similar volume. Compare portfolios
Innovation Score of 40.4/100 blends volume, velocity, technology breadth, and claim depth. How it's calculated

Figures reflect USPTO PatentsView grant data through May 2026; pending applications not yet granted are not counted.

Data sourced from USPTO PatentsView - official U.S. government patent data. See our methodology for computation details. Retrieved and formatted by PlainPatent

Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the USPTO PatentsView database. Consult a qualified professional before making decisions based on this data.

Read our methodology - how this data is sourced, computed, and verified.

Data sources used on this page

USPTO PatentsView - the disambiguated bulk patent-grant, assignee, and CPC data this page's figures are derived from. patentsview.org
Cooperative Patent Classification (CPC) - the joint USPTO/EPO classification scheme used to group patents by technology area. cooperativepatentclassification.org
USPTO Patent Public Search - the official interface to verify the status of any individual patent. ppubs.uspto.gov

Compiled by PlainPatent, US Patent Intelligence Editorial Process · May 15, 2026

Every figure on PlainPatent is rendered directly from USPTO source data, no number is typed in by an editor. This page draws directly on USPTO source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.