Patent US3457438A successfully refreshed from Google Patents.
US3457438A
Expired / Lapsed
US
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Double insulated hand tool with insulating shaft couplings
Assignee: PRECIS (188) Ltd
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Filing: 1968-04-22
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Granted: 1969-07-22
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Expires: 1988-04-22
Abstract
No abstract record available.
Inventors
- 👤 David Norman William Badcock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:10
CPC Classifications
H; H02; H02K; H02K7/00; H02K7/14; H02K7/145; F; F16; F16D; F16D3/00; F16D3/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-21 | 1973-01-20 | 1973-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-21 | 1977-01-20 | 1977-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-21 | 1981-01-20 | 1981-07-22 | $7700.00 | Window Closed / Lapsed |