Patent US2851881A successfully refreshed from Google Patents.
US2851881A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for measuring surface areas
Assignee: Individual
•
Filing: 1956-04-27
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Granted: 1958-09-16
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Expires: 1976-04-27
Abstract
No abstract record available.
Inventors
- 👤 John N Daniel
- 👤 Robert M Mcgregor
- 👤 James H Viccellio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:31
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/28
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
57 words
A METHOD OF MEASURING THE SURFACE AREA OF AN IRREGULAR OR GEOMETRICALLY COMPLEX OBJECT COMPRISING THE STEPS OF WETTING THE ENTIRE SURFACE OF SAID OBJECT WITH A PHENOLPHALEIN SOLUTION OF KNOWN CONCENTRATION, COLLECTING THE PHENOLPTHALEIN SOLUTION WHICH ADHERES TO SAID SURFACE, ADDING A BASE TO SAID SOLUTION TO CAUSE THE PHENOLPHALEIN TO BECOME COLORED, DILUTING THE PHENOL-
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |