US3544222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical instrument for determining layer thickness
Assignee: Leybold Hochvakuum Anlagen GmbH
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Filing: 1967-10-12
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Granted: 1970-12-01
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Expires: 1987-10-12
Abstract
No abstract record available.
Inventors
- 👤 Ulrich Jannasch
- 👤 Gunther Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:42
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/02; G01B11/06; G01B11/0616; G01B11/0625; G01B11/0683
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3322962A
Cited
US3395278A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-30 | 1974-06-01 | 1974-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-30 | 1978-06-01 | 1978-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-30 | 1982-06-01 | 1982-12-01 | $7700.00 | Window Closed / Lapsed |