Patent US3515221A successfully refreshed from Google Patents.
US3515221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scraper blade attachment for tractors
Assignee: FIRST CITY BANK OF CORPUS CHRISTI PO BOX 4666 CORPUS CHRISTI TX 78408
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Filing: 1967-05-09
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Granted: 1970-06-02
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Expires: 1987-05-09
Abstract
No abstract record available.
Inventors
- 👤 Byron Leo Fowler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:15
CPC Classifications
A; A01; A01B; A01B31/00; A01B63/00; A01B63/02; A01B63/10
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) | 1973-06-01 | 1973-12-01 | 1974-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-01 | 1977-12-01 | 1978-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-01 | 1981-12-01 | 1982-06-02 | $7700.00 | Window Closed / Lapsed |