US3350175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colorimetric indicator device for the determination of gases
Assignee: MSA Safety Inc
•
Filing: 1963-07-02
•
Granted: 1967-10-31
•
Expires: 1983-07-02
Abstract
No abstract record available.
Inventors
- 👤 Mcconnaughey Paul Willis
- 👤 Clay Shirley Gross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:01
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N31/222; Y; Y10; Y10T; Y10T436/00; Y10T436/17; Y10T436/173845; Y10T436/175383
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
28 words
A FREE-FLOWING COLORIMETRIC INDICATOR CONSISTING ESSENTIALLY OF A FINELY DIVIDED NON-PROROUS INORGANIC CARRIER COATED WITH A SELF-ADHERENT FILM OF A POWDERED INORGANIC ABSORBENT IMPREGATED WITH A COLORIMETRIC REAGENT.
Claim 2
Dependent Claim
28 words
A FREE-FLOWING COLORIMETRIC INDICATOR CONSISTING ESSENTIALLY OF A FINELY DIVIDED NON-PROROUS INORGANIC CARRIER COATED WITH A SELF-ADHERENT FILM OF A POWDERED INORGANIC ABSORBENT IMPREGATED WITH A COLORIMETRIC REAGENT.
References Cited (Backward Citations)
US2487077A
Cited
US2736638A
Cited
US2939768A
Cited
US2942952A
Cited
US2963351A
Cited
US3068073A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-30 | 1971-05-01 | 1971-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-30 | 1975-05-01 | 1975-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-30 | 1979-05-01 | 1979-10-31 | $7700.00 | Window Closed / Lapsed |