US3081970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Take-off and landing field for jet-propelled aircraft
Assignee: Individual
•
Filing: 1956-09-11
•
Granted: 1963-03-19
•
Expires: 1976-09-11
Abstract
No abstract record available.
Inventors
- 👤 Einarsson Einar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:30
CPC Classifications
B; B64; B64F; B64F1/00; B64F1/26
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
59 words
A TAKE-OFF AND LANDING GRATE FOR JET-PROPELLED AIRCRAFT EMITTING JET STREAMS, COMPRISING A PLURALITY OF SPACED SUPPORTING BEAMS ARRANGED TO ABSORB THE HEAT FROM THE JET STREAMS AS THE LATTER PASS BETWEEN THE BEAMS, AND HAVING MEANS SECURED TO THE BEAMS TO AUTOMATICALLY CLOSE THE SPACES BETWEEN THE BEAMS WHEN THE JET STREAM IS NOT ACTIVE ON THE GRATE.
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US2512431A
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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) | 1966-03-18 | 1966-09-17 | 1967-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-18 | 1970-09-17 | 1971-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-18 | 1974-09-17 | 1975-03-19 | $7700.00 | Window Closed / Lapsed |