US2805539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helical lapping apparatus
Assignee: Balfour Beatty PLC
•
Filing: 1954-12-03
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Granted: 1957-09-10
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Expires: 1974-12-03
Abstract
No abstract record available.
Inventors
- 👤 Burr Harvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:38
CPC Classifications
D; D07; D07B; D07B7/00; D07B7/02; D07B7/14; B; B42; B42B; B42B5/00; B42B5/08; B42B5/12; B42B5/123; H; H01; H01B; H01B13/00; H01B13/06; H01B13/08; H01B13/0816; H01B13/18; H01B13/20; H01B13/206
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) | 1960-09-09 | 1961-03-11 | 1961-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-09 | 1965-03-11 | 1965-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-09 | 1969-03-11 | 1969-09-10 | $7700.00 | Window Closed / Lapsed |