US3477523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulically operated tool for operating under nonatmospheric pressures
Assignee: General Electric Canada Co
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Filing: 1968-03-20
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Granted: 1969-11-11
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Expires: 1988-03-20
Abstract
No abstract record available.
Inventors
- 👤 Ernest Eber Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:49
CPC Classifications
E; E21; E21B; E21B41/00; E21B41/04; B; B25; B25B; B25B21/00; B25B27/00; B25B27/0021; B63; B63C; B63C11/00; B63C11/52; F; F03; F03C; F03C1/00; F03C1/02; F03C1/06; F03C1/0636; F03C1/0644; F03C1/0663; F03C1/26; Y; Y10; Y10S; Y10S173/00; Y10S173/01; Y10S415/00; Y10S415/904
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2904964A
Cited
US3417566A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |