Patent US2830509A successfully refreshed from Google Patents.
US2830509A
Expired / Lapsed
US
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Grating
Assignee: Individual
•
Filing: 1954-04-20
•
Granted: 1958-04-15
•
Expires: 1974-04-20
Abstract
No abstract record available.
Inventors
- 👤 Bustin Leopold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:39
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/30; E04C2/42; E04C2/421; E04C2/426
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US684383A
Cited
US2208020A
Cited
US2305016A
Cited
US2660102A
Cited
US2656903A
Cited
US2668484A
Cited
US2760416A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-14 | 1961-10-14 | 1962-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-14 | 1965-10-14 | 1966-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-14 | 1969-10-14 | 1970-04-15 | $7700.00 | Window Closed / Lapsed |