Patent US3512581A successfully refreshed from Google Patents.
US3512581A
Expired / Lapsed
US
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Cryogenic devices
Assignee: Balfour Beatty PLC
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Filing: 1968-07-02
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Granted: 1970-05-19
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Expires: 1988-07-02
Abstract
No abstract record available.
Inventors
- 👤 John E Lawton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:56
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/14; F16L59/141; H; H01; H01B; H01B12/00; H01B12/14; Y; Y02; Y02E; Y02E40/00; Y02E40/60; Y10; Y10S; Y10S165/00; Y10S165/051; Y10S165/052; Y10S165/06; Y10S165/061
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) | 1973-05-18 | 1973-11-17 | 1974-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-18 | 1977-11-17 | 1978-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-18 | 1981-11-17 | 1982-05-19 | $7700.00 | Window Closed / Lapsed |