Patent US3442220A successfully refreshed from Google Patents.
US3442220A
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US
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Rotary pump
Assignee: Rolls Royce PLC
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Filing: 1968-08-06
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Granted: 1969-05-06
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Expires: 1988-08-06
Abstract
No abstract record available.
Inventors
- 👤 Anthony William Thomas Mottram
- 👤 John Lanfear Scott-Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:19
CPC Classifications
F; F04; F04D; F04D15/00; F04D15/0005; F04D15/0022; F04D29/00; F04D29/18; F04D29/181; F04D29/22; F04D29/2261; F04D29/2277; F04D9/00; F04D9/001; F04D9/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1509653A
Cited
DE531831C
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US2206033A
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US2726606A
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US3163119A
Cited
US3168048A
Cited
US3299821A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-05 | 1972-11-04 | 1973-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-05 | 1976-11-04 | 1977-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-05 | 1980-11-04 | 1981-05-06 | $7700.00 | Window Closed / Lapsed |