Patent US3209772A successfully refreshed from Google Patents.
US3209772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control gear for turbines
Assignee: Associated Electrical Industries Ltd
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Filing: 1961-12-22
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Granted: 1965-10-05
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Expires: 1981-12-22
Abstract
No abstract record available.
Inventors
- 👤 Atkinson Myles Birkett
- 👤 Barratt Frederick Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:39
CPC Classifications
F; F01; F01D; F01D21/00; F01D21/02; G; G05; G05D; G05D13/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
AN OVERSPEED LIMITING DEVICE FOR USE WITH TURBINES, COMPRISING: A MAIN PISTON WORKING IN A MAIN CYLINDER, SAID MAIN PISTON HAVING AN OPERATING ROD ADAPTED TO BE CONNECTED TO OPERATE THE ADMISSION VALVES OF A TURBINE WITH WHICH THE DEVICE MAY BE USED; A SOLENOID ADAPTED FOR AUTOMATICALLY RESPONDING TO LOAD CHANGES OF A TURBINE WITH WHICH THE DEVICE IS TO BE USED; A VALVE OPERATIVELY CONNECTED TO SAID SOLENOID TO ADMIT FLUID UNDER PRESSURE TO ONE SIDE OF SAID MAIN PISTON WHEN SAID SOLENOID IS IN A POSITION CORRESPONDING TO NORMAL RUNNING SPEED AND TO RELIEVE PRESSURE FROM SAID ONE SIDE OF SAID MAIN PISTON WHEN SAID SOLENOID IS IN A POSITION CORRESPONDING TO AN OVERSPEED CONDITION; A SPRING FOR MOVING SAID MAIN PISTON IN OPPOSITION TO THE FORCE OF SAID PRESSURE FLUID; RE-
Claim 2
Dependent Claim
135 words
AN OVERSPEED LIMITING DEVICE FOR USE WITH TURBINES, COMPRISING: A MAIN PISTON WORKING IN A MAIN CYLINDER, SAID MAIN PISTON HAVING AN OPERATING ROD ADAPTED TO BE CONNECTED TO OPERATE THE ADMISSION VALVES OF A TURBINE WITH WHICH THE DEVICE MAY BE USED; A SOLENOID ADAPTED FOR AUTOMATICALLY RESPONDING TO LOAD CHANGES OF A TURBINE WITH WHICH THE DEVICE IS TO BE USED; A VALVE OPERATIVELY CONNECTED TO SAID SOLENOID TO ADMIT FLUID UNDER PRESSURE TO ONE SIDE OF SAID MAIN PISTON WHEN SAID SOLENOID IS IN A POSITION CORRESPONDING TO NORMAL RUNNING SPEED AND TO RELIEVE PRESSURE FROM SAID ONE SIDE OF SAID MAIN PISTON WHEN SAID SOLENOID IS IN A POSITION CORRESPONDING TO AN OVERSPEED CONDITION; A SPRING FOR MOVING SAID MAIN PISTON IN OPPOSITION TO THE FORCE OF SAID PRESSURE FLUID; RE-
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) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |