Patent US3030813A successfully refreshed from Google Patents.
US3030813A
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US
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Assignee: INTERNAT RES and DEV CORP
•
Filing: 1956-03-20
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Granted: 1962-04-24
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Expires: 1976-03-20
Abstract
No abstract record available.
Inventors
- 👤 Arthur R Crawford
- 👤 Walter R Rushin
- 👤 Richard E Porter
- 👤 Paul A Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:33
CPC Classifications
G; G01; G01M; G01M1/00; G01M1/14; G01M1/16; G01M1/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2133687A
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US2300198A
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US2448323A
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US2616288A
Cited
GB632652A
Cited
US2651937A
Cited
US2636381A
Cited
US2783648A
Cited
GB726107A
Cited
US2741756A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-23 | 1965-10-23 | 1966-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-23 | 1969-10-23 | 1970-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-23 | 1973-10-23 | 1974-04-24 | $7700.00 | Window Closed / Lapsed |