Patent US1333767A successfully refreshed from Google Patents.
US1333767A
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Method of making tempered blades
Assignee: NAPIER SAW WORKS Inc
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Filing: 1918-12-09
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Granted: 1920-03-16
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Expires: 1938-12-09
Abstract
No abstract record available.
Inventors
- 👤 Napier Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:36
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/24; B; B23; B23D; B23D65/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1923-03-16 | 1923-09-15 | 1924-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1927-03-16 | 1927-09-15 | 1928-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1931-03-16 | 1931-09-15 | 1932-03-16 | $7700.00 | Window Closed / Lapsed |