Patent US2514550A successfully refreshed from Google Patents.
US2514550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of synthetic fibers with formaldehyde
Assignee: Celanese Corp
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Filing: 1948-02-14
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Granted: 1950-07-11
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Expires: 1968-02-14
Abstract
No abstract record available.
Inventors
- 👤 Samuel B Mcfarlane
- 👤 Gilbert E Moos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:58
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/10; D06M13/144; D06M13/12; D06M13/127
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
PROCESS FOR THE TREATMENT OF FILAMENTS HAVING A BASIS OF A POLYMERIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF POLYURETHANES AND POLYCARBAMIDES, WHICH COMPRISES HEATING SAID FILAMENTS IN A SOLUTION OF A SUBSTANCE, SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE-YIELDING SUBSTANCES, CONTAINING SUFFICIENT SODIUM HYDROXIDE TO MAINTAIN THE PH OF SAID SOLUTION AT AT LEAST 10.
Claim 2
Dependent Claim
56 words
PROCESS FOR THE TREATMENT OF FILAMENTS HAVING A BASIS OF A POLYMERIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF POLYURETHANES AND POLYCARBAMIDES, WHICH COMPRISES HEATING SAID FILAMENTS IN A SOLUTION OF A SUBSTANCE, SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE-YIELDING SUBSTANCES, CONTAINING SUFFICIENT SODIUM HYDROXIDE TO MAINTAIN THE PH OF SAID SOLUTION AT AT LEAST 10.
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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) | 1953-07-10 | 1954-01-09 | 1954-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-10 | 1958-01-09 | 1958-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-10 | 1962-01-09 | 1962-07-11 | $7700.00 | Window Closed / Lapsed |