CS-004 Nivea/Eucerit Origin Patent: Lifschütz's 1902 DRP Number Hits the DPMA Direct-Interactive-Search Wall — None of Beiersdorf's Official Chronicle 12 PDF, Wikipedia (en/de), German Chemie-Schule, German PharmaWiki, or Jüdische Allgemeine Records the DRP Number; the 1900-1903 DRP Records Are Outside DPMA DEPATISnet's Electronic Coverage. Cosmetic Form 3 Information Wall, Excavation #2.

About this memo

The primary-source URL existence is confirmed "as a corporate-historical fact," but the patent number itself could not be identified from web-public sources. Day 22 handover (a) executed "DPMA direct search," but early-1900s DRP records are outside DPMA DEPATISnet's electronic-coverage scope and require interactive search UI or paper archive direct inquiry. This memo confirms the finding "Lifschütz's 1902 patent DRP number lies behind an information wall" as cosmetic form-3 information wall excavation #2.

1. Patent basic info (what is verifiable from web-public sources)

2. Core: structure of the DPMA information wall

For Day 22 handover (a), we executed the action "identify Lifschütz's 1902 DRP number via DPMA direct search." The execution path:

[STEP 1] Web-public source coverage
  - Beiersdorf official About Us / Personalities / Lifschütz page
  - Beiersdorf official Eucerin Brand History page
  - Beiersdorf official Chronicle 12 PDF (5.7 MB, pdftotext full extraction)
  - Wikipedia en Eucerin
  - Wikipedia de Isaac Lifschütz
  - German Chemie-Schule Eucerit / Lifschütz entries
  - German PharmaWiki Wollwachsalkohole
  - German Jüdische Allgemeine "Der Doktor aus Pinsk"
  - German LinkFang / Grokipedia / DeWiki (Wikipedia derivatives)
  - German Eucerit Wikipedia
  - Beiersdorf official Markengeschichte Eucerin (de)
  - German Brennessel-München / Aliacura / Olionatura / Apothekenwiki (Wollwachsalkohol specialist sites)

[STEP 2] DRP number presence check
  → Result: none of the 13 above contains the DRP number
  → Beiersdorf Chronicle 12 PDF has the explainer "1) Patent number — This number precisely
    identifies the patent and allows it to be referenced at the patent office. Dr. Isaac Lifschütz
    laid the foundation for dermatological skin care with the patent for a method of producing
    highly water-absorbent ointment bases." (number-as-concept), but the number itself is absent

[STEP 3] DPMA DEPATISnet direct search attempts
  - depatisnet.dpma.de Expert Search UI via WebFetch
  → Returned UI HTML only, zero search results (interactive input required, no submission via curl/WebFetch)
  - Espacenet REST API (worldwide.espacenet.com)
  → HTTP 403 Forbidden (API key required, unauthenticated access denied)
  - Google Patents (patents.google.com) inventor=Lifschütz / before=1903 search
  → results: 0 (early-1900s DE/DRP outside Google Patents DE coverage)

[STEP 4] AI-generated candidate-number entity verification
  - Search engine WebSearch for "DRP 132307," "DRP 154959," "DRP 171146," "Patentschrift 154959 Lifschütz"
  → No relevant hits, no number information on Wollwachsalkohol specialist sites
  - patents.google.com individual-number curl
  → Captcha "Sorry... your computer or network may be sending automated queries" rejected all
  → Candidate numbers possibly generated by AI (Search AI Overview) cannot be verified

[STEP 5] Information wall confirmed
  → DPMA paper archive direct inquiry (DPMA HQ in Munich or Imperial Patent Office successor in Berlin)
  → or Beiersdorf company archive direct inquiry (Beiersdorf PR / Beiersdorf Stiftung)
  → remains the next action

3. Structural features of the cosmetic-subseries form-3 information wall

Among the four forms of the cosmetic-subseries DB-reliability problem, form 3 information wall is now confirmed at excavation #2 with this memo (CS-004), following Day 22 ep80 CS-010 Sansho Seiyaku kojic acid (J-PlatPat direct interactive search wall). Structural features of form 3 information wall:

In other words, "the historical fact is told, but the origin patent number alone lies behind the wall of the legacy database system" is reproduced across two countries — Japan and Germany. The patent groups handled by Phase 1 cosmetic subseries — late-19th-century to early-20th-century, and 1980s Japan — likely face this structural information-wall problem systematically.

4. Strictly Speaking (simplified 3 items)

Confirmed facts:

• Beiersdorf official Chronicle 12 PDF (5.7 MB, https://www.beiersdorf.com/~/media/Beiersdorf/about-us/our-history/chronicle/2024/chronicle-12/Beiersdorf-chronicle-12-en-pdf.pdf, pdftotext extracted) contains no DRP number in body text.
• Wikipedia en "Eucerin," de "Isaac Lifschütz," Chemie-Schule, PharmaWiki, Jüdische Allgemeine all omit the DRP number (retrieved 2026-05-09).
• Lifschütz held 20 patents over his lifetime (German Wikipedia: "Lifschütz hielt 20 Patente"), but the Eucerit 1902 patent number is not recorded.
• DPMA DEPATISnet (https://depatisnet.dpma.de/) is interactive-search-UI-only; no submission via curl/WebFetch.
• Espacenet REST API HTTP 403 Forbidden (authentication required).
• Google Patents early-1900s DE patent coverage is thin; inventor=Lifschütz / before=1903 search returns 0.

Unconfirmed:

• DRP number itself (DPMA paper archive or Beiersdorf company archive inquiry required).
• Lifschütz's other 19 patents' numbers, titles, filing dates.
• Exact 1911 acquisition price and contract terms paid by Beiersdorf to Lifschütz.

Where this comparison breaks:

• Writing "Eucerit's 1902 patent is the origin of Nivea" risks overlooking the fact that Nivea Cream itself was developed in 1911 by a 3-person team — Troplowitz, Lifschütz, and Unna — as a separate product. Eucerit is the emulsifier, while Nivea Cream is emulsifier + mineral oil + water mixture. Calling Eucerit alone "Nivea's origin" overstates the case.
• The Lifschütz 1902 patent's title "method of producing highly water-absorbent ointment bases" is a pharmaceutical-domain ointment base, not a cosmetic. Its cosmetic positioning was a 1911 commercial decision by Troplowitz post-acquisition. Classifying it under "Cosmetic Patent subseries" is an AI Archaeology convenience; the patent's domain is pharmaceutical.
• Writing "DPMA information wall" risks giving the impression that DPMA is intentionally obfuscating, but the reality is that early-1900s DRP electronic coverage is incomplete and the paper archive cross-reference system is consolidated into the interactive search UI. The information wall is structural, not adversarial.

References:

• Beiersdorf official Chronicle 12 PDF (Eucerin, 5.7 MB, English) — primary source, no DRP number in body
• Beiersdorf official Personalities — Dr. Isaac Lifschütz — only "In 1900, he registered this manufacturing process with the patent office"
• Wikipedia de "Isaac Lifschütz" — only "Lifschütz hielt 20 Patente"
• Wikipedia en "Eucerin" — only 1900 filing / 1902 grant
• DPMA DEPATISnet (interactive search UI) — paper archive / 1900s old DRP requires interactive search
• Day 22 ep80 (CS-010 Sansho Seiyaku kojic acid information wall) — form 3 information wall #1
• Day 23 ep82 (SW-001 Engelbart mouse US3541541) — SW subseries launch #1
• Day 23 ep84 (CS-005 avobenzone Givaudan 1973 information wall) — form 3 information wall #3