Patent US2690290A successfully refreshed from Google Patents.
Patent US3238957A successfully refreshed from Google Patents.
US3238957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic heading control for aircraft
Assignee: Brittain Industries Inc
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Filing: 1962-11-28
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Granted: 1966-03-08
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Expires: 1982-11-28
Abstract
No abstract record available.
Inventors
- 👤 Clarkson Alick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:33
CPC Classifications
B; B64; B64C; B64C13/00; B64C13/24; Y; Y10; Y10T; Y10T137/00; Y10T137/0753; Y10T137/8158; Y10T137/8225; Y10T137/8593; Y10T137/86493; Y10T137/86863; Y10T137/86871
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
A MAGNETIC HEADING CONTROL, COMPRISING: A CASING; A DIRECTIONAL COMPASS MAGNET HAVING A SHAFT FIXED THERETO AND BEING MOUNTED FOR FREE ROTATION ABOUT A FIXED AXIS IN SAID CASING; A HOLLOW CYLINDRICAL VALVE BODY ROTATABLY MOUNTED IN SAID CASING COAXIAL WITH SAID SHAFT AND HAVING AN AIR INLET FROM THE EXTERIOR OF THE CASING; SAID VALVE BODY HAVING A PAIR OF SUBSTANTIALLY DIAMETRICALLY OPPOSED AND AXIALLY SPACED PORTS; A SLEEVE FIXED IN SAID VALVE BODY HAVING A PAIR OF DIAMETRICALLY AND AXIALLY OPPOSED APERTURES COMMUNICATING INDIVIDUALLY WITH SAID PORTS; PASSAGES IN SAID CASING COMMUNICATING WITH SAID PORTS INDIVIDUALLY IN ALL POSITIONS OF THE VALVE BODY AND HAVING VACUUM SOURCE CONNECTIONS THEREIN; SAID SHAFT HAVING A FLAT PORTION DISPOSED BETWEEN SAID APERTURES AND CONSTITUTING A VALVE ELEMENT TO EXPOSE SAID APERTURES EQUALLY IN ONE POSITION FOR NEUTRAL OPERATION, AND UNEQUALLY FOR DIFFERENTIAL CONTROL OF VACUUM IN SAID PASSAGES; A CONTROL KNOB SECURED TO SAID VALVE BODY FOR ROTATION THEREOF RELATIVE TO SAID SHAFT; AND A GRADUATED DIAL FIXED TO SAID CONTROL KNOB.
Claim 2
Dependent Claim
171 words
A MAGNETIC HEADING CONTROL, COMPRISING: A CASING; A DIRECTIONAL COMPASS MAGNET HAVING A SHAFT FIXED THERETO AND BEING MOUNTED FOR FREE ROTATION ABOUT A FIXED AXIS IN SAID CASING; A HOLLOW CYLINDRICAL VALVE BODY ROTATABLY MOUNTED IN SAID CASING COAXIAL WITH SAID SHAFT AND HAVING AN AIR INLET FROM THE EXTERIOR OF THE CASING; SAID VALVE BODY HAVING A PAIR OF SUBSTANTIALLY DIAMETRICALLY OPPOSED AND AXIALLY SPACED PORTS; A SLEEVE FIXED IN SAID VALVE BODY HAVING A PAIR OF DIAMETRICALLY AND AXIALLY OPPOSED APERTURES COMMUNICATING INDIVIDUALLY WITH SAID PORTS; PASSAGES IN SAID CASING COMMUNICATING WITH SAID PORTS INDIVIDUALLY IN ALL POSITIONS OF THE VALVE BODY AND HAVING VACUUM SOURCE CONNECTIONS THEREIN; SAID SHAFT HAVING A FLAT PORTION DISPOSED BETWEEN SAID APERTURES AND CONSTITUTING A VALVE ELEMENT TO EXPOSE SAID APERTURES EQUALLY IN ONE POSITION FOR NEUTRAL OPERATION, AND UNEQUALLY FOR DIFFERENTIAL CONTROL OF VACUUM IN SAID PASSAGES; A CONTROL KNOB SECURED TO SAID VALVE BODY FOR ROTATION THEREOF RELATIVE TO SAID SHAFT; AND A GRADUATED DIAL FIXED TO SAID CONTROL KNOB.
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) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |