US2099028A - Finger print powder - Google Patents

Finger print powder Download PDF

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Publication number
US2099028A
US2099028A US52070A US5207035A US2099028A US 2099028 A US2099028 A US 2099028A US 52070 A US52070 A US 52070A US 5207035 A US5207035 A US 5207035A US 2099028 A US2099028 A US 2099028A
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US
United States
Prior art keywords
powder
finger print
hydroquinone
acacia
weight
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 - Lifetime
Application number
US52070A
Inventor
Justin J Mccarthy
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.)
Individual
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Individual
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
Priority claimed from US11105A external-priority patent/US2028619A/en
Application filed by Individual filed Critical Individual
Priority to US52070A priority Critical patent/US2099028A/en
Application granted granted Critical
Publication of US2099028A publication Critical patent/US2099028A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/117—Identification of persons
    • A61B5/1171—Identification of persons based on the shapes or appearances of their bodies or parts thereof
    • A61B5/1172—Identification of persons based on the shapes or appearances of their bodies or parts thereof using fingerprinting

Definitions

  • This invention relates to a finger print powder.
  • My new finger print powder preferably consists of hydroquinone and acacia ground together. Best results are obtained if the powder is ground fine enough to pass through silk.
  • the hydroquinone should preferably exceed the aca- 25 cia by weight; and I have secured good results by using eight parts hydroquinone and one part acacia by weight, although this proportion can be varied considerably and still obtain satisfactory results.
  • the hydroquinone is a reducing agent in an alkaline solution, and other reducing agents such as metol could be used, although I prefer hydroquinone.
  • the acacia is a water soluble gum, and while I prefer acacia, other water soluble gums might be used. Acacia is sometimes called gum arabic. It acts as a binder between the finger print and the powder 5 of which it forms a part.
  • a finger print powder comprising hydroquinone and acacia, the said hydroquinone exceeding the said acacia in said powder by weight.
  • a finger print powder comprising hydroquinone and acacia, the said hydroquinone exceeding the said acacia in said powder more than double by weight.
  • a finger print powder comprising hydroqui- 15 none, and a water soluble gum, said hydroquinone exceeding said gum more than double by weight.
  • a finger print powder comprising hydroquinone, and a water soluble gum, the said hydroquinone exceeding the said water soluble gum in 2 said powder by weight.
  • a finger print powder comprising a plurality of parts by weight of hydroquinone, and one part by weight of acacia, the two being ground together into a powder fine enough to pass through 25 silk.
  • a finger print powder comprising eight parts by weight of hydroquinone and one part by weight of acacia.

Description

Patented Nov. 16, 1937 UNITED STATES PATENT OFFICE FINGER PRINT POWDER Justin J. McCarthy, Boston, Mass.
6 Claims.
This application is a. division of one filed by me on March 14th, 1935, Serial No. 11,105 now Patent No. 2,028,619 issued Jan. 21, 1936.
This invention relates to a finger print powder.
At the present time when conditions such as poor light, inaccessibility, et cetera, make it difiicult or impossible to obtain a photograph of finger prints, it is the custom to sprinkle powder on said finger prints, and after brushing off the 10 surplus powder, taking an impression by means of a piece of tape. The impression so obtained is not as clear and distinct as it should be, and it is my object to produce an entirely new powder, which when used in combination with a sensi- 15 tized sheet treated with a solution, will obtain finger print impressions which are distinct and clear. My method of obtaining finger prints is fully described in said application filed March 14th, 1935, Serial No. 11,105.
20 My new finger print powder preferably consists of hydroquinone and acacia ground together. Best results are obtained if the powder is ground fine enough to pass through silk. The hydroquinone should preferably exceed the aca- 25 cia by weight; and I have secured good results by using eight parts hydroquinone and one part acacia by weight, although this proportion can be varied considerably and still obtain satisfactory results. The hydroquinone is a reducing agent in an alkaline solution, and other reducing agents such as metol could be used, although I prefer hydroquinone. Likewise the acacia is a water soluble gum, and while I prefer acacia, other water soluble gums might be used. Acacia is sometimes called gum arabic. It acts as a binder between the finger print and the powder 5 of which it forms a part.
What I claim is:
1. A finger print powder comprising hydroquinone and acacia, the said hydroquinone exceeding the said acacia in said powder by weight. 10
2. A finger print powder comprising hydroquinone and acacia, the said hydroquinone exceeding the said acacia in said powder more than double by weight.
3. A finger print powder comprising hydroqui- 15 none, and a water soluble gum, said hydroquinone exceeding said gum more than double by weight.
4. A finger print powder comprising hydroquinone, and a water soluble gum, the said hydroquinone exceeding the said water soluble gum in 2 said powder by weight.
5. A finger print powder comprising a plurality of parts by weight of hydroquinone, and one part by weight of acacia, the two being ground together into a powder fine enough to pass through 25 silk.
6. A finger print powder comprising eight parts by weight of hydroquinone and one part by weight of acacia.
JUSTIN J. MCCARTHY. 3o
US52070A 1935-03-14 1935-11-29 Finger print powder Expired - Lifetime US2099028A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US52070A US2099028A (en) 1935-03-14 1935-11-29 Finger print powder

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11105A US2028619A (en) 1935-03-14 1935-03-14 Method of obtaining fingerprints
US52070A US2099028A (en) 1935-03-14 1935-11-29 Finger print powder

Publications (1)

Publication Number Publication Date
US2099028A true US2099028A (en) 1937-11-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
US52070A Expired - Lifetime US2099028A (en) 1935-03-14 1935-11-29 Finger print powder

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US (1) US2099028A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2604664A (en) * 1950-02-03 1952-07-29 Firestone Tire & Rubber Co Preparation of sponge rubber from foamed latex
US4339279A (en) * 1978-06-16 1982-07-13 Hesselgren Sven Gunnar Retention composition for dental prosthesis

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2604664A (en) * 1950-02-03 1952-07-29 Firestone Tire & Rubber Co Preparation of sponge rubber from foamed latex
US4339279A (en) * 1978-06-16 1982-07-13 Hesselgren Sven Gunnar Retention composition for dental prosthesis

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