Patent US3217807A successfully refreshed from Google Patents.
US3217807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor blade
Assignee: Bell Aerospace Corp
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Filing: 1964-08-28
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Granted: 1965-11-16
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Expires: 1984-08-28
Abstract
No abstract record available.
Inventors
- 👤 Jr William K Underhill
- 👤 Wesley L Cresap
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:36
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/46; B64C27/473; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
A ROTOR BLADE CONSTRUCTION COMPRISING, IN COMBINATION, AN ELONGATE LEADING EDGE MEMBER HAVING NOSE PORTION AND TRAILING LEG PORTIONS DISPOSED IN VERTICALLY SPACED RELATION AND PROJECTING REARWARDLY FROM SAID NOSE PORTION, AN ELONGATED BULKHEAD STRIP SPANNING BETWEEN AND INTERCONNECTING SAID TRAILING LEGS PORTIONS AT THE FREE EDGES THEREOF, A FRUSTO-CONICAL HONEYCOMB SLAB HAVING FLAT OPPOSITE SIDES AND A WIDE EDGE PORTION SECURED TO SAID BULKHEAD STRIP, PRESENTING ITS OPPOSITE SIDE SUBSTANTIALLY AS CONTINUATIONS OF THE OUTER SURFACES OF THE RESPECTIVE TRAILING LEG PORTIONS, AND HAVING A NARROW EDGE PORTION SUBSTANTIALLY PARALLEL AND SPACED REARWARDLY FROM SAID BULKHEAD STRIP, AN ELONGATE TRAILING EDGE MEMBER SECURED ALONG SAID NARROW EDGE PORTION OF THE HONEYCOMB SLAB AND HAVING UPPER AND LOWER SURFACE DISPOSED SUBSTANTIALY AS CONTINUATION OF SAID OPPOSITE SIDES OF THE HONEYCOMB SLAB, AND A PAIR OF SKIN PLATES, EACH OF SIAD SKIN SPLATES BEING SECURED TO ONE SIDE OF SAID HONEYCOMB SLAB AND HAVING FORWARD AND REAR EDGE PORTIONS OVERLAPPING ONTO AND SECURED TO THE CORRESPONDING OF SAID OUTER SURFACES OF THE LEADING AND TRAILING EDGE MEMBERS.
Claim 2
Dependent Claim
176 words
A ROTOR BLADE CONSTRUCTION COMPRISING, IN COMBINATION, AN ELONGATE LEADING EDGE MEMBER HAVING NOSE PORTION AND TRAILING LEG PORTIONS DISPOSED IN VERTICALLY SPACED RELATION AND PROJECTING REARWARDLY FROM SAID NOSE PORTION, AN ELONGATED BULKHEAD STRIP SPANNING BETWEEN AND INTERCONNECTING SAID TRAILING LEGS PORTIONS AT THE FREE EDGES THEREOF, A FRUSTO-CONICAL HONEYCOMB SLAB HAVING FLAT OPPOSITE SIDES AND A WIDE EDGE PORTION SECURED TO SAID BULKHEAD STRIP, PRESENTING ITS OPPOSITE SIDE SUBSTANTIALLY AS CONTINUATIONS OF THE OUTER SURFACES OF THE RESPECTIVE TRAILING LEG PORTIONS, AND HAVING A NARROW EDGE PORTION SUBSTANTIALLY PARALLEL AND SPACED REARWARDLY FROM SAID BULKHEAD STRIP, AN ELONGATE TRAILING EDGE MEMBER SECURED ALONG SAID NARROW EDGE PORTION OF THE HONEYCOMB SLAB AND HAVING UPPER AND LOWER SURFACE DISPOSED SUBSTANTIALY AS CONTINUATION OF SAID OPPOSITE SIDES OF THE HONEYCOMB SLAB, AND A PAIR OF SKIN PLATES, EACH OF SIAD SKIN SPLATES BEING SECURED TO ONE SIDE OF SAID HONEYCOMB SLAB AND HAVING FORWARD AND REAR EDGE PORTIONS OVERLAPPING ONTO AND SECURED TO THE CORRESPONDING OF SAID OUTER SURFACES OF THE LEADING AND TRAILING EDGE MEMBERS.
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) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |