Patent US3503307A successfully refreshed from Google Patents.
US3503307A
Expired / Lapsed
US
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Diaphragms
Assignee: Rolls Royce Power Engineering PLC
•
Filing: 1968-03-28
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Granted: 1970-03-31
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Expires: 1988-03-28
Abstract
No abstract record available.
Inventors
- 👤 Kazimierz Migdal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:09
CPC Classifications
F; F16; F16J; F16J3/00; F16J3/02; F16K; F16K31/00; F16K31/12; F16K31/126; G; G05; G05D; G05D16/00; G05D16/14; G05D16/18; G05D16/185
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-30 | 1973-09-29 | 1974-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-30 | 1977-09-29 | 1978-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-30 | 1981-09-29 | 1982-03-31 | $7700.00 | Window Closed / Lapsed |