Patent US3493801A successfully refreshed from Google Patents.
US3493801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
D.c. electrical machine
Assignee: Rheinmetall Air Defence AG
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Filing: 1967-11-21
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Granted: 1970-02-03
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Expires: 1987-11-21
Abstract
No abstract record available.
Inventors
- 👤 Rudolf Walser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:09
CPC Classifications
H; H02; H02K; H02K23/00; H02K23/02; H02K23/24; H02K1/00; H02K1/06; H02K1/12; H02K1/14; H02K1/146; H02K3/00; H02K3/04; H02K3/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1173153A
Cited
US2092058A
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US2130843A
Cited
US2235075A
Cited
US2575705A
Cited
US2777080A
Cited
US3056896A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-02 | 1973-08-04 | 1974-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-02 | 1977-08-04 | 1978-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-02 | 1981-08-04 | 1982-02-03 | $7700.00 | Window Closed / Lapsed |