US3567330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control means
Assignee: Atlas Copco AB
•
Filing: 1969-08-18
•
Granted: 1971-03-02
•
Expires: 1989-08-18
Abstract
Abstract IN A ROTATIONAL SPEED CONTROL MEANS FOR HAND SUSTAINED PRESSURE FLUID DRIVEN GRINDING, DRILLING AND LIKE MACHINES, PREFERABLY FOR DENTAL WORK, AN UPPER LIMIT IS PUT ON THE NUMBER OF REVOLUTIONS PER MINUTE OF THE MACHINE FROM IDLING AND UP TO FULL WORKING LOAD BY A CONTROL VALVE AND A CONTROL CIRCUIT COOPERATING TO DIVERT OR TO THROTTLE PRESSURE FLUID IN THE CONTROL VALVE IN ADVANCE OF THE MACHINE SUCH AS TO MAINTAIN AUTOMATICALLY UNDER ANY PARTIAL LOAD A PREDETERMINED SELECTIVE UPPER ROTATIONAL SPEED LIMIT FOR THE MACHINE.
Inventors
- 👤 Ulf Martin Christian Apelskog
- 👤 Lennart Erik Idoft Gidlund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:53
CPC Classifications
A; A61; A61C; A61C1/00; A61C1/02; A61C1/05; A61C1/0007; F; F01; F01D; F01D15/00; F01D15/06; F01D15/062; Y; Y10; Y10S; Y10S415/00; Y10S415/904
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |