DE29702542U1 - Indicator for moisture absorbing filters, especially water filters - Google Patents

Indicator for moisture absorbing filters, especially water filters

Info

Publication number
DE29702542U1
DE29702542U1 DE29702542U DE29702542U DE29702542U1 DE 29702542 U1 DE29702542 U1 DE 29702542U1 DE 29702542 U DE29702542 U DE 29702542U DE 29702542 U DE29702542 U DE 29702542U DE 29702542 U1 DE29702542 U1 DE 29702542U1
Authority
DE
Germany
Prior art keywords
filters
indicator
moisture absorbing
especially water
water filters
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
DE29702542U
Other languages
German (de)
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.)
Riensch & Held
Original Assignee
Riensch & Held
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 Riensch & Held filed Critical Riensch & Held
Priority to DE29702542U priority Critical patent/DE29702542U1/en
Publication of DE29702542U1 publication Critical patent/DE29702542U1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
    • G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
    • G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
    • G01N21/81—Indicating humidity

Landscapes

  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Plasma & Fusion (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
DE29702542U 1997-02-14 1997-02-14 Indicator for moisture absorbing filters, especially water filters Expired - Lifetime DE29702542U1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE29702542U DE29702542U1 (en) 1997-02-14 1997-02-14 Indicator for moisture absorbing filters, especially water filters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE29702542U DE29702542U1 (en) 1997-02-14 1997-02-14 Indicator for moisture absorbing filters, especially water filters

Publications (1)

Publication Number Publication Date
DE29702542U1 true DE29702542U1 (en) 1997-03-27

Family

ID=8035920

Family Applications (1)

Application Number Title Priority Date Filing Date
DE29702542U Expired - Lifetime DE29702542U1 (en) 1997-02-14 1997-02-14 Indicator for moisture absorbing filters, especially water filters

Country Status (1)

Country Link
DE (1) DE29702542U1 (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE28520C (en) * W. RÜCKERT in Liebenwalde Combination of gelatine with chlorocobalt, chlorinated copper and nitric acid nickel oxide to indicate the moisture content of the air
US1933803A (en) * 1929-01-03 1933-11-07 Eastman Kodak Co Hygrometer
US3019638A (en) * 1959-11-02 1962-02-06 William F Klein Moisture indicating device
US3680364A (en) * 1970-06-22 1972-08-01 Roger E Carrier Monitoring humidity
DE2708435B1 (en) * 1977-02-26 1978-07-27 Riensch & Held Procedure for the detection of the fatty saturation of filter material as well as a corresponding grease filter, especially for extractor hoods
DE3303941A1 (en) * 1983-02-05 1984-08-09 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Humidity measuring device
DE3438769C2 (en) * 1984-10-23 1988-10-06 Christian Heinrich Sandler Gmbh & Co Kg, 8676 Schwarzenbach, De
DE3741764A1 (en) * 1987-12-10 1989-06-22 Licentia Gmbh Grease filter mat from a batt for vapour hoods
WO1992002804A1 (en) * 1990-07-31 1992-02-20 Dansk Teknologisk Institut A humidity indicator with an encapsulated sensor

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE28520C (en) * W. RÜCKERT in Liebenwalde Combination of gelatine with chlorocobalt, chlorinated copper and nitric acid nickel oxide to indicate the moisture content of the air
US1933803A (en) * 1929-01-03 1933-11-07 Eastman Kodak Co Hygrometer
US3019638A (en) * 1959-11-02 1962-02-06 William F Klein Moisture indicating device
US3680364A (en) * 1970-06-22 1972-08-01 Roger E Carrier Monitoring humidity
DE2708435B1 (en) * 1977-02-26 1978-07-27 Riensch & Held Procedure for the detection of the fatty saturation of filter material as well as a corresponding grease filter, especially for extractor hoods
DE3303941A1 (en) * 1983-02-05 1984-08-09 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Humidity measuring device
DE3438769C2 (en) * 1984-10-23 1988-10-06 Christian Heinrich Sandler Gmbh & Co Kg, 8676 Schwarzenbach, De
DE3741764A1 (en) * 1987-12-10 1989-06-22 Licentia Gmbh Grease filter mat from a batt for vapour hoods
WO1992002804A1 (en) * 1990-07-31 1992-02-20 Dansk Teknologisk Institut A humidity indicator with an encapsulated sensor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JP 1-250843 A., In: Patents Abstracts of Japan, P-983, Dec. 25, 1989, Vol. 13,No.587 *

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Legal Events

Date Code Title Description
R207 Utility model specification

Effective date: 19970507

R021 Search request validly filed

Effective date: 19970304

R163 Identified publications notified

Effective date: 19970423

R150 Term of protection extended to 6 years

Effective date: 20000405

R157 Lapse of ip right after 6 years

Effective date: 20030829