Patent US3137655A successfully refreshed from Google Patents.
US3137655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical brightening
Assignee: Glanzstoff AG
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Filing: 1961-03-21
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Granted: 1964-06-16
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Expires: 1981-03-21
Abstract
No abstract record available.
Inventors
- 👤 Taul Horst
- 👤 Sommer Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:20
CPC Classifications
C; C07; C07D; C07D235/00; C07D235/02; C07D235/04; C07D235/06; C07D235/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
18 words
A SYNTHETIC LINEAR POLYAMIDE TEXTILE ARTICLE CONTAINING AS AN OPTICAL BRIGHTENING AGENT THE COMPOUND OF THE FORMULA: BENZIMIDAZOL-2-YL-CH=CH-(1,4-PHENYLENE)-COOH
References Cited (Backward Citations)
US2965648A
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US2349979A
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US2345700A
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US2791564A
Cited
US2793192A
Cited
US2985661A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |