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Patent US2993402A successfully refreshed from Google Patents.
US2993402A
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Measuring of materials by use of polarized light
Assignee: Libbey Owens Ford Glass Co
•
Filing: 1956-08-03
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Granted: 1961-07-25
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Expires: 1976-08-03
Abstract
No abstract record available.
Inventors
- 👤 Donald W Dunipace
- 👤 John R Ermlich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:01
CPC Classifications
G; G01; G01L; G01L1/00; G01L1/24; G01L1/241
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2237565A
Cited
US1874217A
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US1996446A
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GB540876A
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US2332674A
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US2450761A
Cited
US2503808A
Cited
US2861493A
Cited
US2864278A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |