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US3489338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas turbine engines
Assignee: Dowty Rotol Ltd
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Filing: 1967-04-12
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Granted: 1970-01-13
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Expires: 1987-04-12
Abstract
No abstract record available.
Inventors
- 👤 John Alfred Chilman
- 👤 Stuart Duncan Davies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:00
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/54; F02K1/64; F02K1/66; F01; F01D; F01D7/00; F02K3/00; F02K3/02; F02K3/04; F02K3/06; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/321; F04D29/322; F04D29/323; F05; F05D; F05D2220/00; F05D2220/30; F05D2220/36; F05D2260/00; F05D2260/70; F05D2260/74; F05D2260/76; Y; Y02; Y02T; Y02T50/00; Y02T50/60
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) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |