Patent US3525006A successfully refreshed from Google Patents.
US3525006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon fibre brush
Assignee: National Research Development Corp UK
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Filing: 1968-02-29
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Granted: 1970-08-18
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Expires: 1988-02-29
Abstract
No abstract record available.
Inventors
- 👤 Norman Lawrence Parr
- 👤 Sam Bolshaw
- 👤 Edwin Richard Wells May
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:13
CPC Classifications
H; H01; H01R; H01R39/00; H01R39/02; H01R39/18; H01R39/24
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) | 1973-08-17 | 1974-02-16 | 1974-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-17 | 1978-02-16 | 1978-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-17 | 1982-02-16 | 1982-08-18 | $7700.00 | Window Closed / Lapsed |