Patent US3574673A successfully refreshed from Google Patents.
US3574673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated cutting edges
Assignee: Dow Silicones Corp
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Filing: 1969-04-24
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Granted: 1971-04-13
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Expires: 1989-04-24
Abstract
Abstract ARTICLES HAVING FINE CUTTING EDGES, SUCH AS RAZOR BLADES, THE EDGES OF WHICH ARE COATED WITH COPOLYMERS OF METHYLSILOXANE AND AMINOALKYLSILOXANE UNITS, SUCH AS -SI(-CH3)2-O- AND H2N-(CH2)3-SI(-CH3)-O- TO REDUCE THE CUTTING FORCE NECESSARY TO UTILIZE THE ARTICLE.
Inventors
- 👤 Carl W Schweiger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:16
CPC Classifications
B; B26; B26B; B26B21/00; B26B21/54; B26B21/58
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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |