CS-005 Avobenzone (Parsol 1789) Origin Patent Hits the USPTO Patent Public Search / Espacenet Interactive-Search Wall — None of Wikipedia en Avobenzone, PubChem, Pharmacompass, Smartskincare, ScienceDirect, Univar, or The Cosmetic Chemist Records the 1973 Origin Patent Number; Only the Assignee Lineage Roure Bertrand Dupont SA → Givaudan-Roure → DSM Nutritional Products Is Confirmable. Cosmetic Form 3 Information Wall, Excavation #3.

About this memo

The assignee corporate-history lineage (Roure Bertrand Dupont → Givaudan-Roure → DSM Nutritional Products) is confirmable from web-public sources, but the 1973 origin patent number itself could not be identified from web-public sources. Day 22 handover (a) executed "USPTO direct search," but USPTO Patent Public Search and Espacenet Worldwide Search both require interactive UIs that curl/WebFetch cannot use. This memo confirms the finding "avobenzone 1973 origin patent number lies behind an information wall" as cosmetic form-3 information wall excavation #3.

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

2. Core: structure of the USPTO/Espacenet information wall

For Day 22 handover (a), we executed the action "identify the 1973 origin patent number for avobenzone via USPTO/Espacenet direct search." The execution path:

[STEP 1] Web-public source coverage
  - Wikipedia en "Avobenzone"
  - PubChem CID 51040 Avobenzone
  - Pharmacompass "PARSOL 1789 (AVOBENZONE)"
  - Smartskincare.com "Avobenzone (Parsol 1789, Eusolex 9020, Escalol 517)"
  - ScienceDirect "Avobenzone — an overview"
  - Univar Solutions "Parsol 1789 USP"
  - The Cosmetic Chemist "Avobenzone"
  - MakingCosmetics "Avobenzone 258"
  - CosDNA Avobenzone
  - Wikidoc "Avobenzone"
  - EWG Skin Deep Avobenzone
  - Incidecoder "Butyl Methoxydibenzoylmethane"
  - Specialchem "Butyl Methoxydibenzoylmethane"
  - Wikipedia en "Dibenzoylmethane" (parent compound)
  - PubChem CID 8433 Dibenzoylmethane
  - Givaudan SA Wikipedia derivative pages / GlobalData company info

[STEP 2] 1973 origin patent number presence check
  → Result: none of the 16 above contains the 1973 origin patent number
  → Wikipedia en Avobenzone has only the single body line "Avobenzone was patented in 1973"
  → Same Wikipedia article's citations [36][37] OpenURL are "rft.cc=US&rft.number=0" with
    empty number field — no direct link to the specific patent

[STEP 3] WebSearch tries on AI-generated candidate numbers
  - "Lerch Givaudan avobenzone Parsol 1789 patent 1973" search
  → No hits for the surname Lerch, only general Wikipedia Avobenzone information
  - "Lifschütz Eucerit DRP 132307 154959 Wollwachsalkohol" search
  → No number information, only Wollwachsalkohol specialist sites
  - "DE2354187 CH562252 US3920734 avobenzone dibenzoylmethane sunscreen 1973" search
  → No standalone hits for these candidate numbers
  → One search result returned AI-generated detail "Swiss patent applications filed on
    December 16, 1971, referencing CH1851571A and CH1592074A, which correspond to the
    Swiss patents CH561168A5 and CH570454A5," but a follow-up WebSearch for CH561168A5
    standalone returned no related hits, indicating Search-AI-Overview-generated content
    that cannot be entity-verified

[STEP 4] patents.google.com individual access tries
  - patents.google.com/patent/CH561168A5 → WebFetch HTTP 503
  - patents.google.com/xhr/query?url=q%3DCH561168A5 → curl Captcha
    "Sorry... your computer or network may be sending automated queries" rejected all
  - patents.google.com/?q=Lifschütz&country=DE&before=publication:19031231 → 0 results

[STEP 5] Espacenet REST API try
  - worldwide.espacenet.com/3.2/rest-services/publication-data/...
  → HTTP 403 Forbidden (API key required, unauthenticated access denied)

[STEP 6] Information wall confirmed
  → USPTO Patent Public Search interactive search (assignee=Roure Bertrand Dupont,
    priority=1971-1974, CH/US/DE/EP/FR) interactive narrowing required
  → or DSM Nutritional Products / Givaudan SA direct inquiry
  → AI-generated candidate numbers cannot be entity-verified, so they are not adopted
    (fabrication risk avoidance, applies feedback_source_no_fabrication)

3. Structural features of the cosmetic-subseries form-3 information wall (third excavation)

Among the four forms of the cosmetic-subseries DB-reliability problem, form 3 information wall is now confirmed at excavation #3 with this memo (CS-005). Lining up the three excavations clarifies the structural features.

Lining up the three excavations, the information wall reproduces structurally regardless of country, language, or era. The legacy publication systems handled by the Phase 1 cosmetic subseries — late-19th-century to early-20th-century DRP / 1970s CH-FR / 1980s Tokkō-shō — share the wall of interactive search UI / API authentication / Captcha defense in modern web-based patent databases (patents.google.com, worldwide.espacenet.com, USPTO Patent Public Search).

In other words, the cosmetic-subseries DB-reliability problem is the structural problem "the historical fact is told, but the origin patent number alone lies on the other side of the interactive search UI." It must be read as a problem of the historical layer structure of the patent-database system, not a problem specific to individual cosmetic ingredients.

4. Strictly Speaking (simplified 3 items)

Confirmed facts:

• Avobenzone is butyl methoxydibenzoylmethane (INCI), CAS 70356-09-1, trademark Parsol® 1789 (PubChem CID 51040).
• Patented in 1973 (Wikipedia en Avobenzone: "Avobenzone was patented in 1973").
• 1978 EU approval, 1988 FDA OTC approval.
• Assignee transition: Roure Bertrand Dupont SA (France) → ~1991 Givaudan-Roure merger → 2000 DSM Nutritional Products → 2010s+ DSM (currently dsm-firmenich.com manages Parsol® 1789 trademark).
• Both USPTO Patent Public Search and Espacenet Worldwide Search require interactive UI / API authentication.
• patents.google.com as of 2026-05-09 frequently rejects curl/WebFetch with Captcha "Sorry... your computer or network may be sending automated queries."

Unconfirmed:

• The exact 1973 origin patent number (one of CH/FR/US/DE/EP).
• Inventor names (Wikipedia, PubChem, Pharmacompass, Smartskincare all lack records).
• AI-generated candidate numbers (CH561168A5, CH570454A5, US3920734, DE2354187, etc.) cannot be entity-verified, so they are not adopted.

Where this comparison breaks:

• Writing "Givaudan invented in 1973" risks overlooking the fact that the company name at the time was Roure Bertrand Dupont SA, and Givaudan-Roure merger was 1991. Givaudan SA (Switzerland, Vernier) was founded in 1796, and Roure Bertrand Dupont SA (France, Grasse) was a separate company; 1991 saw their merger within the Roche group as Givaudan-Roure. They were separate legal entities in 1973.
• Writing "avobenzone is a UVA absorber" risks overlooking the fact that modern avobenzone is rarely a standalone product; it is combined with other UVA absorbers like Tinosorb S, Mexoryl SX, Uvinul A Plus, etc. Avobenzone alone is photo-unstable (decomposes under UV; 80%+ loss in 1 hour), so modern sunscreen formulations are a three-layer structure of avobenzone + stabilizer (octocrylene, etc.) + other UVA absorbers.
• Writing "FDA OTC approval 1988" — avobenzone was approved as a sunscreen active ingredient in the 1988 FDA Final Monograph, but the 2019 FDA proposed rule designated it for GRASE (generally recognized as safe and effective) re-evaluation, and additional safety data is currently being requested. FDA approval is not a static fact; regulatory re-evaluation is ongoing as a dynamic state.
• Writing "USPTO information wall" risks giving the impression that USPTO is intentionally obfuscating, but the reality is that USPTO Patent Public Search's interactive UI is unusable from curl/WebFetch; with browser access, 1971-1974 priority Roure Bertrand Dupont patent groups can be browsed. The information wall is structural, not adversarial.

References:

• Wikipedia en "Avobenzone" — only "patented in 1973," no number
• PubChem CID 51040 Avobenzone — compound info, no number
• Pharmacompass "PARSOL 1789 (AVOBENZONE)" — commercial info, no number
• DSM Firmenich PARSOL® 1789 product page — current trademark holder, no past patent number recorded
• USPTO Patent Public Search (interactive UI) — direct search is the next action
• 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 ep83 (CS-004 Nivea Lifschütz 1902 DRP information wall) — form 3 information wall #2