FR883607A - Coin gris - Google Patents

Coin gris

Info

Publication number
FR883607A
FR883607A FR883607DA FR883607A FR 883607 A FR883607 A FR 883607A FR 883607D A FR883607D A FR 883607DA FR 883607 A FR883607 A FR 883607A
Authority
FR
France
Prior art keywords
gray
corner
gray corner
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Application granted granted Critical
Publication of FR883607A publication Critical patent/FR883607A/fr
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/205—Neutral density filters

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
FR883607D 1941-02-11 1942-06-26 Coin gris Expired FR883607A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE883607X 1941-02-11

Publications (1)

Publication Number Publication Date
FR883607A true FR883607A (fr) 1943-07-09

Family

ID=6832106

Family Applications (1)

Application Number Title Priority Date Filing Date
FR883607D Expired FR883607A (fr) 1941-02-11 1942-06-26 Coin gris

Country Status (1)

Country Link
FR (1) FR883607A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2934172A (en) * 1955-03-09 1960-04-26 Proctor & Schwartz Inc Light transmissive color standard

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2934172A (en) * 1955-03-09 1960-04-26 Proctor & Schwartz Inc Light transmissive color standard

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