US3490230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion air control shutter
Assignee: United States Department of the Navy
•
Filing: 1968-03-22
•
Granted: 1970-01-20
•
Expires: 1988-03-22
Abstract
No abstract record available.
Inventors
- 👤 Paul W Pillsbury
- 👤 Jeffrey K Suter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:51
CPC Classifications
F; F23; F23R; F23R3/00; F23R3/02; F23R3/26; F05; F05B; F05B2250/00; F05B2250/40; F05B2250/41; F05B2250/411
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1733792A
Cited
US2227666A
Cited
US2560207A
Cited
US2770096A
Cited
US2907171A
Cited
US2960823A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-19 | 1973-07-21 | 1974-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-19 | 1977-07-21 | 1978-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-19 | 1981-07-21 | 1982-01-20 | $7700.00 | Window Closed / Lapsed |