US2670522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Braking mechanism
Assignee: Celanese Corp
•
Filing: 1949-06-30
•
Granted: 1954-03-02
•
Expires: 1969-06-30
Abstract
No abstract record available.
Inventors
- 👤 Frank M Culpepper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:07
CPC Classifications
D; D03; D03D; D03D49/00; D03D49/04; D03D49/06; D03D49/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US631430A
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US912942A
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US973344A
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US1062443A
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US1103661A
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US1536047A
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US1828918A
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US2103821A
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US2252419A
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US2340921A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-01 | 1957-08-31 | 1958-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-01 | 1961-08-31 | 1962-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-01 | 1965-08-31 | 1966-03-02 | $7700.00 | Window Closed / Lapsed |