Patent US2775580A successfully refreshed from Google Patents.
US2775580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfobenzyl lignins
Assignee: Phillips Petroleum Co
•
Filing: 1953-05-25
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Granted: 1956-12-25
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Expires: 1973-05-25
Abstract
No abstract record available.
Inventors
- 👤 Scarth Virgil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:03
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/16; C04B24/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
10 words
A NEW COMPOSITION OF MATTER CHARACTERIZED BY THE FOLLOWING FORMULATION
Claim 2
Dependent Claim
10 words
A NEW COMPOSITION OF MATTER CHARACTERIZED BY THE FOLLOWING FORMULATION
References Cited (Backward Citations)
US2379889A
Cited
US2485102A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-25 | 1960-06-25 | 1960-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-25 | 1964-06-25 | 1964-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-25 | 1968-06-25 | 1968-12-25 | $7700.00 | Window Closed / Lapsed |