Patent US3005779A successfully refreshed from Google Patents.
US3005779A
Expired / Lapsed
US
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Process for the optical brightening of polyacrylonitrile fibers
Assignee: BASF Schweiz AG
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Filing: 1959-08-03
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Granted: 1961-10-24
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Expires: 1979-08-03
Abstract
No abstract record available.
Inventors
- 👤 Ackermann Franz
- 👤 Siegrist Adolf Emil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:47
CPC Classifications
C; C07; C07D; C07D235/00; C07D235/02; C07D235/04; C07D235/20; C07D235/06; C07D235/14; C07D235/18; D; D06; D06L; D06L4/00; D06L4/60; D06L4/614; D06L4/657
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A PROCESS FOR THE OPTICAL BRIGHTENING OF POLYACRYLONITRILE FIBERS WHICH COMPRISES APPLYING TO SAID FIBERS IN AQUEOUS MEDIUM FROM 0.01 TO 3.0 PERCENT, CALCULATED ON THE WEIGHT OF SAID FIBERS, OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF THE COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
44 words
A PROCESS FOR THE OPTICAL BRIGHTENING OF POLYACRYLONITRILE FIBERS WHICH COMPRISES APPLYING TO SAID FIBERS IN AQUEOUS MEDIUM FROM 0.01 TO 3.0 PERCENT, CALCULATED ON THE WEIGHT OF SAID FIBERS, OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF THE COMPOUND OF THE FORMULA
References Cited (Backward Citations)
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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) | 1964-10-23 | 1965-04-24 | 1965-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-23 | 1969-04-24 | 1969-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-23 | 1973-04-24 | 1973-10-24 | $7700.00 | Window Closed / Lapsed |