// Domain Record: historical-patent-center-2020
historical-patent-center.us
Former institutional data repository providing environmental monitoring data to state departments. Domain lapsed after budget cuts in 2025.
// Current Metrics
35 Domain Authority
24 Domain Rating
15 Spam Score
13,468 Backlinks
605 Referring Domains
12y Domain Age
Backlink Profile
// Historical Trend Data
Authority Trend
| Year | DA | DR | Backlinks |
|---|---|---|---|
| 2021 | 36 | 24 | 14,633 |
| 2022 | 32 | 21 | 13,776 |
| 2023 | 37 | 25 | 14,100 |
| 2024 | 32 | 21 | 17,256 |
| 2025 | 38 | 27 | 15,256 |
// Related Domains in Health & Medical Expired Domains
| Domain | DA | DR | Backlinks |
|---|---|---|---|
| dept-tax-data.io | 89 | 101 | 3,751 |
| center-security-watch.edu | 88 | 92 | 50,048 |
| hub-transport-data.org | 88 | 100 | 15,767 |
| records-medical-tracker.net | 87 | 77 | 21,038 |
| commission-census-brief.org | 87 | 95 | 23,303 |