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US2986511A
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Apparatus for measuring the ph of solutions
Assignee: Leica Microsystems Inc
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Filing: 1957-08-27
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Granted: 1961-05-30
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Expires: 1977-08-27
Abstract
No abstract record available.
Inventors
- 👤 James D Digby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:59
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/416; G01N27/4166; G01N27/4167
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
IN APPARATUS FOR MEASURING THE PH OF A SOLUTION, A TUBULAR MEMBER ADAPTED TO RECEIVE A LIQUID, A PH RESPONSIVE GLASS MEMBRANE CLOSING ONE END OF SAID MEMBER AND AN ELONGATED PISTON-LIKE SUPPORT EXTENDING WITHIN SAID SLIDABLY RECEIVING AND HOLDING SAID TUBULAR MEMBER IN SEALED ENGAGEMENT THEREWITH, SAID TUBULAR MEMBER UPON IMMERSION IN SAID SOLUTION BEING AUTOMATICALLY MOVABLE RELATIVE TO SAID SUPPORT AND EQUALIZING THE PRESSURES ON THE INNER AND OUTER SURFACVES OF SAID GLASS MEMBRANE.
Claim 2
Dependent Claim
76 words
IN APPARATUS FOR MEASURING THE PH OF A SOLUTION, A TUBULAR MEMBER ADAPTED TO RECEIVE A LIQUID, A PH RESPONSIVE GLASS MEMBRANE CLOSING ONE END OF SAID MEMBER AND AN ELONGATED PISTON-LIKE SUPPORT EXTENDING WITHIN SAID SLIDABLY RECEIVING AND HOLDING SAID TUBULAR MEMBER IN SEALED ENGAGEMENT THEREWITH, SAID TUBULAR MEMBER UPON IMMERSION IN SAID SOLUTION BEING AUTOMATICALLY MOVABLE RELATIVE TO SAID SUPPORT AND EQUALIZING THE PRESSURES ON THE INNER AND OUTER SURFACVES OF SAID GLASS MEMBRANE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-29 | 1964-11-28 | 1965-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-29 | 1968-11-28 | 1969-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-29 | 1972-11-28 | 1973-05-30 | $7700.00 | Window Closed / Lapsed |