US2545576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic control of evaporated metal film thickness
Assignee: National Research Corp
•
Filing: 1948-02-21
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Granted: 1951-03-20
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Expires: 1968-02-21
Abstract
No abstract record available.
Inventors
- 👤 Godley Philip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:23
CPC Classifications
H; H01; H01G; H01G13/00; H01G13/06; C; C23; C23C; C23C14/00; C23C14/22; C23C14/54; C23C14/542; C23C14/545; G; G01; G01B; G01B7/00; G01B7/02; G01B7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-19 | 1954-09-18 | 1955-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-19 | 1958-09-18 | 1959-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-19 | 1962-09-18 | 1963-03-20 | $7700.00 | Window Closed / Lapsed |