Patent US3191084A successfully refreshed from Google Patents.
US3191084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current collector assembly for small d. c. motors
Assignee: Hitachi Ltd
•
Filing: 1962-11-20
•
Granted: 1965-06-22
•
Expires: 1982-11-20
Abstract
No abstract record available.
Inventors
- 👤 Ooka Hiroshi
- 👤 Oshima Shuzo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:36
CPC Classifications
H; H02; H02K; H02K13/00; H02K13/006; H02K13/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A COMMUTATOR DEVICE FOR A MICROMOTOR COMPRISING A COMMUTATOR ON THE ROTOR SHAFT OF THE MICROMOTOR INCLUDING COMMUTATOR SEGMENTS MADE OF A SILVER-PALLADIUM ALLOY CONSISTING ESSENTIALLY OF 80% TO 60% SILVER AND 20% TO 40% PALLADIUM, AND METALLIC BRUSH HOLDERS FIXEDLY ARRANGED ABOUT THE COMMUTATOR AND EACH CARRYING A BRUSH MADE OF A PLATINUM-IRIDIUM ALLOY CONSISTING ESSENTIALLY OF 95% TO 70% PLATINUM AND 5% TO 30% IRIDIUM IN A MANNER SO THAT THE BRUSH IS HELD IN SLIDING CONTACT WITH THE COMMUTATOR.
Claim 2
Dependent Claim
82 words
A COMMUTATOR DEVICE FOR A MICROMOTOR COMPRISING A COMMUTATOR ON THE ROTOR SHAFT OF THE MICROMOTOR INCLUDING COMMUTATOR SEGMENTS MADE OF A SILVER-PALLADIUM ALLOY CONSISTING ESSENTIALLY OF 80% TO 60% SILVER AND 20% TO 40% PALLADIUM, AND METALLIC BRUSH HOLDERS FIXEDLY ARRANGED ABOUT THE COMMUTATOR AND EACH CARRYING A BRUSH MADE OF A PLATINUM-IRIDIUM ALLOY CONSISTING ESSENTIALLY OF 95% TO 70% PLATINUM AND 5% TO 30% IRIDIUM IN A MANNER SO THAT THE BRUSH IS HELD IN SLIDING CONTACT WITH THE COMMUTATOR.
References Cited (Backward Citations)
FR1098618A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-21 | 1968-12-21 | 1969-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-21 | 1972-12-21 | 1973-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-21 | 1976-12-21 | 1977-06-22 | $7700.00 | Window Closed / Lapsed |