Patent US3552821A successfully refreshed from Google Patents.
US3552821A
Expired / Lapsed
US
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Borescope for use at high temperatures and pressures
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1967-09-05
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Granted: 1971-01-05
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Expires: 1987-09-05
Abstract
Abstract A BORESCOPE FOR USE IN VISUAL INSPECTION OF THE INTERNAL CONDITIONS OF OPERATING PRESSURE VESSELS AND PROCESS EQUIPMENT WHICH COMPRISES AN OPTICAL BORESCOPE PROVIDED WITH A TEMPERATURE AND PRESSURE-RESISTANT OUTER HOUSING AND ASSOCIATED COMPONENTS. THE BORESCOPE IS COOLED BY A COOLING FLUID CIRCULATED THROUGH A PORTION OF THE SPACE BETWEEN THE BORESCOPE HOUSING AND THE OUTER HOUSING, AND RETURNED THROUGH ANOTHER PORTION OF SAID SPACE AND IS PROTECTED FROM DUST AND PRESSURE DAMAGE BY THE OUTER HOUSING.
Inventors
- 👤 Newbold O Cross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:15
CPC Classifications
G; G02; G02B; G02B23/00; G02B23/24; G02B23/2476; G02B23/2492
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |