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Patent US3487879A successfully refreshed from Google Patents.
US3487879A
Expired / Lapsed
US
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Blades,suitable for propellers,compressors,fans and the like
Assignee: Dowty Rotol Ltd
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Filing: 1968-07-22
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Granted: 1970-01-06
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Expires: 1988-07-22
Abstract
No abstract record available.
Inventors
- 👤 Roy F J Mccarthy
- 👤 William G Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:32
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/34; F04D29/36; F04D29/321; F04D29/324
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2868441A
Cited
GB775816A
Cited
US2934317A
Cited
US2868439A
Cited
GB787500A
Cited
US3132841A
Cited
US2929755A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-05 | 1973-07-07 | 1974-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-05 | 1977-07-07 | 1978-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-05 | 1981-07-07 | 1982-01-06 | $7700.00 | Window Closed / Lapsed |