US3475859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for observing the contents of an enclosure
Assignee: Centre de Recherches Metallurgiques CRM ASBL
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Filing: 1967-11-17
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Granted: 1969-11-04
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Expires: 1987-11-17
Abstract
No abstract record available.
Inventors
- 👤 Robert Pirlet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:43
CPC Classifications
C; C21; C21B; C21B7/00; C21B7/24; B; B01; B01J; B01J19/00; B01J19/0053; B01J3/00; B01J3/004; F; F23; F23M; F23M11/00; F23M11/04; F23M11/042; G; G01; G01F; G01F23/00; G01F23/22; G01F23/28; G01F23/284; G01F23/292
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) | 1972-11-03 | 1973-05-05 | 1973-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-03 | 1977-05-05 | 1977-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-03 | 1981-05-05 | 1981-11-04 | $7700.00 | Window Closed / Lapsed |