Patent CA1000070A successfully refreshed from Google Patents.
Patent US2838504A successfully refreshed from Google Patents.
US2838504A
Expired / Lapsed
US
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Benzimidazolylstilbene whitening and brightening agents
Assignee: STWB Inc
•
Filing: 1955-04-21
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Granted: 1958-06-10
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Expires: 1975-04-21
Abstract
No abstract record available.
Inventors
- 👤 Nathan N Crounse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:26
CPC Classifications
C; C07; C07D; C07D235/00; C07D235/02; C07D235/04; C07D235/20; C11; C11D; C11D3/00; C11D3/40; C11D3/42; C11D9/00; C11D9/04; C11D9/44; C11D9/448; D; D06; D06L; D06L4/00; D06L4/60; D06L4/607; D06L4/614; D06L4/621; D06L4/636
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
AN BENZIMIDAZOLYLSTIBENE HAVING THE STRUCTURAL FORMULA
Claim 2
Dependent Claim
6 words
AN BENZIMIDAZOLYLSTIBENE HAVING THE STRUCTURAL FORMULA
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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) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |