US3075489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for reducing drag on submerged vehicles
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1960-10-28
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Granted: 1963-01-29
•
Expires: 1980-10-28
Abstract
No abstract record available.
Inventors
- 👤 Hans P Eichenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:17
CPC Classifications
B; B63; B63B; B63B1/00; B63B1/32; B63B1/34; B63B1/38; Y; Y02; Y02T; Y02T70/00; Y02T70/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
IN A BODY ADAPTED TO MOVE SUBMERGED RELATIVE TO A LIQUID MEDIUM, AND HAVING DRAG REDUCTION STRUCTURE PROVIDING AN ENCIRCLING STABLE GAS FILM ABOUT THE BODY, SAID DRAG REDUCTION STRUCTURE COMPRISING: (A) A BLUNT ANNULAR FRONT-END BODY PORTION; (B) FIRST ANNULARLY ARRANGED MEANS, OPENING ON THE FRONT OF SAID ANNULAR BODY PORTION, FOR WITHDRAWING A RADIALLY OUTWARDLY MOVING LIQUID-MEDIUM BOUNDARY-LAYER; AND (C) SECOND ANNULARLY ARRANGED MEANS OPENING ON THE FRONT OF SAID ANNULAR BODY PORTION NEAR THE PERIPHERY THEREOF, AND CLOSELY ENCIRCLING SAID FIRST MEANS, FOR FLOWING THE GAS FILM ONTO THE BODY.
Claim 2
Dependent Claim
93 words
IN A BODY ADAPTED TO MOVE SUBMERGED RELATIVE TO A LIQUID MEDIUM, AND HAVING DRAG REDUCTION STRUCTURE PROVIDING AN ENCIRCLING STABLE GAS FILM ABOUT THE BODY, SAID DRAG REDUCTION STRUCTURE COMPRISING: (A) A BLUNT ANNULAR FRONT-END BODY PORTION; (B) FIRST ANNULARLY ARRANGED MEANS, OPENING ON THE FRONT OF SAID ANNULAR BODY PORTION, FOR WITHDRAWING A RADIALLY OUTWARDLY MOVING LIQUID-MEDIUM BOUNDARY-LAYER; AND (C) SECOND ANNULARLY ARRANGED MEANS OPENING ON THE FRONT OF SAID ANNULAR BODY PORTION NEAR THE PERIPHERY THEREOF, AND CLOSELY ENCIRCLING SAID FIRST MEANS, FOR FLOWING THE GAS FILM ONTO THE BODY.
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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) | 1966-01-28 | 1966-07-30 | 1967-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-28 | 1970-07-30 | 1971-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-28 | 1974-07-30 | 1975-01-29 | $7700.00 | Window Closed / Lapsed |