US2489569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of concentrating solutions of synthetic linear polyamides
Assignee: Tootal Broadhurst Lee Co Ltd
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Filing: 1947-10-24
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Granted: 1949-11-29
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Expires: 1967-10-24
Abstract
No abstract record available.
Inventors
- 👤 Foulds Robinson Percy
- 👤 Roscoe William Hilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:45
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08J3/05; C09; C09D; C09D177/00; D; D01; D01F; D01F6/00; D01F6/58; D01F6/60; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/59; C08J2377/00
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) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |