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Patent US3021646A successfully refreshed from Google Patents.
US3021646A
Expired / Lapsed
US
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Sand blast apparatus
Assignee: Individual
•
Filing: 1959-04-16
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Granted: 1962-02-20
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Expires: 1979-04-16
Abstract
No abstract record available.
Inventors
- 👤 Sumner B Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:21
CPC Classifications
B; B24; B24C; B24C7/00; B24C7/0046; Y; Y10; Y10T; Y10T137/00; Y10T137/4673; Y10T137/479
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US783218A
Cited
US2388818A
Cited
US2409722A
Cited
US2569952A
Cited
US2791494A
Cited
US2938305A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-19 | 1965-08-21 | 1966-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-19 | 1969-08-21 | 1970-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-19 | 1973-08-21 | 1974-02-20 | $7700.00 | Window Closed / Lapsed |