Patent US2245667A successfully refreshed from Google Patents.
Patent US2754677A successfully refreshed from Google Patents.
US2754677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nondestructive testing of thin shells by differential pressure
Assignee: Individual
•
Filing: 1952-12-23
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Granted: 1956-07-17
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Expires: 1972-12-23
Abstract
No abstract record available.
Inventors
- 👤 John C New
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:54
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/08; G01N3/10; G01N3/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
THE METHOD OF NONDESTRUCTIVE TESTING OF THIN-WALLED SHELLS BY DIFFERENTIAL PRESSURE AND COMPRISING THE STEPS OF APPLYING CONTINUALLY INCREASING PRESSURE TO THE EXTERIOR OF A SEALED LIQUID-FILLED SHELL, REPEATEDLY COMPARING THE EXTERIOR PRESSURE SIMULTANEOUSLY WITH THE INTERIOR PRESSURE OF THE SHELL UNTIL THE PRESSURE DIFFERENTIAL THEE-
Claim 2
Independent Claim
46 words
THE METHOD OF NONDESTRUCTIVE TESTING OF THIN-WALLED SHELLS BY DIFFERENTIAL PRESSURE AND COMPRISING THE STEPS OF APPLYING CONTINUALLY INCREASING PRESSURE TO THE EXTERIOR OF A SEALED LIQUID-FILLED SHELL, REPEATEDLY COMPARING THE EXTERIOR PRESSURE SIMULTANEOUSLY WITH THE INTERIOR PRESSURE OF THE SHELL UNTIL THE PRESSURE DIFFERENTIAL THEE-
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) | 1959-07-17 | 1960-01-16 | 1960-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-17 | 1964-01-16 | 1964-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-17 | 1968-01-16 | 1968-07-17 | $7700.00 | Window Closed / Lapsed |