US2998745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical-thickness and refractiveindex meter
Assignee: Individual
•
Filing: 1956-04-05
•
Granted: 1961-09-05
•
Expires: 1976-04-05
Abstract
No abstract record available.
Inventors
- 👤 John F Mcclellan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:57
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/41; G01B; G01B11/00; G01B11/02; G01B11/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1503543A
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US1939088A
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US2216716A
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US2365580A
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US2379263A
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US2429066A
Cited
US2645971A
Cited
GB684435A
Cited
US2719235A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-04 | 1965-03-06 | 1965-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-04 | 1969-03-06 | 1969-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-04 | 1973-03-06 | 1973-09-05 | $7700.00 | Window Closed / Lapsed |