US2856543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for maintaining standby power source in immediate readiness
Assignee: HK Porter Co Inc
•
Filing: 1956-12-19
•
Granted: 1958-10-14
•
Expires: 1976-12-19
Abstract
No abstract record available.
Inventors
- 👤 Kobert W Dixon
- 👤 Jr Henry F Plate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:04
CPC Classifications
H; H02; H02J; H02J9/00; H02J9/04; H02J9/06; H02J9/08; Y; Y02; Y02B; Y02B70/00; Y02B70/30; Y04; Y04S; Y04S20/00; Y04S20/20
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-13 | 1962-04-14 | 1962-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-13 | 1966-04-14 | 1966-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-13 | 1970-04-14 | 1970-10-14 | $7700.00 | Window Closed / Lapsed |