US2999972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized power supply
Assignee: Dresser Industries Inc
•
Filing: 1958-03-13
•
Granted: 1961-09-12
•
Expires: 1978-03-13
Abstract
No abstract record available.
Inventors
- 👤 Larry J Stroman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:09
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1557562A
Cited
US2565621A
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US2725515A
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US2758211A
Cited
US2791739A
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US2829254A
Cited
GB784444A
Cited
US2783380A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-11 | 1965-03-13 | 1965-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-11 | 1969-03-13 | 1969-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-11 | 1973-03-13 | 1973-09-12 | $7700.00 | Window Closed / Lapsed |