Patent US4301391A successfully refreshed from Google Patents.
Patent US3287961A successfully refreshed from Google Patents.
US3287961A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detection of surfactants
Assignee: EMD Millipore Corp
•
Filing: 1964-05-06
•
Granted: 1966-11-29
•
Expires: 1984-05-06
Abstract
No abstract record available.
Inventors
- 👤 James L Dwyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:24
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/26; G01N33/28; G01N33/2835
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
THE METHOD OF TESTING A WATER IMMISCIBLE LIQUID FOR THE PRESENCE OF SURFACTANTS COMPRISING ADDING WATER TO SAID LIQUID AND MIXING IT THEREWITH, SEPARATING WATER FROM SAID LIQUID AND PLACING IT ON A HYDROPHOBIC FILTER THEN APPLYING A SUFFICIENT PRESSURE DIFFERENTIAL ACROSS SAID FILTER TO FORCE THE WATER THERETHROUGH, AND MEASURING SAID PRESSEURE.
Claim 2
Independent Claim
53 words
THE METHOD OF TESTING A WATER IMMISCIBLE LIQUID FOR THE PRESENCE OF SURFACTANTS COMPRISING ADDING WATER TO SAID LIQUID AND MIXING IT THEREWITH, SEPARATING WATER FROM SAID LIQUID AND PLACING IT ON A HYDROPHOBIC FILTER THEN APPLYING A SUFFICIENT PRESSURE DIFFERENTIAL ACROSS SAID FILTER TO FORCE THE WATER THERETHROUGH, AND MEASURING SAID PRESSEURE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |