US3547377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Counterflow jet flap helicopter
Assignee: PETER J FREY
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Filing: 1968-03-28
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Granted: 1970-12-15
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Expires: 1988-03-28
Abstract
No abstract record available.
Inventors
- 👤 Peter J Frey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:10
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/325; B64C11/00; B64C11/16; B64C11/20; B64C11/24; B64C27/20; B64C27/54; B64C27/72; B64C2027/7205; B64C2027/7211; B64C2027/725; Y; Y02; Y02T; Y02T50/00; Y02T50/30; Y10; Y10S; Y10S415/00; Y10S415/914
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-14 | 1974-06-15 | 1974-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-14 | 1978-06-15 | 1978-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-14 | 1982-06-15 | 1982-12-15 | $7700.00 | Window Closed / Lapsed |