US2947871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for determining the composition and thickness of thin layers
Assignee: Individual
•
Filing: 1955-08-01
•
Granted: 1960-08-02
•
Expires: 1975-08-01
Abstract
No abstract record available.
Inventors
- 👤 Friedman Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:37
CPC Classifications
G; G01; G01N; G01N23/00; G01N23/22; G01N23/223; G01N23/02; G01N23/06; G01N23/083; G01N23/16; G01N2223/00; G01N2223/07; G01N2223/076
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2542822A
Cited
US2659823A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-02 | 1964-02-01 | 1964-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-02 | 1968-02-01 | 1968-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-02 | 1972-02-01 | 1972-08-02 | $7700.00 | Window Closed / Lapsed |