Patent US2361805A successfully refreshed from Google Patents.
US2622979A
Expired / Lapsed
US
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Modified synthetic resin and paper containing the same
Assignee: Hercules Powder Co
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Filing: 1947-08-14
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Granted: 1952-12-23
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Expires: 1967-08-14
Abstract
No abstract record available.
Inventors
- 👤 Gerald I Keim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:06
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/40; D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/47; D21H17/49; D21H17/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A HIGH WET STRENGTH PAPER CONTAINER FROM ABOUT 0.1% TO ABOUT 8%, BASED ON THE DRY WEIGHT OF THE PAPER, OF A THERMOSETTING LIGNIN SULFONATEMODIFIED UREA-FORMALDEHYDE RESIN, SAID LIGNIN SULFONATE-MODIFIED UREA-FORMALDEHDE RESIN BEING PREPARED FROM BETWEEN 1.8 AND 2.0 MOLES OF FORMALYDEHYDE FOR EACH MOLE OF UREA AND BETWEEN ABOUT 5 TO ABOUT 20 PARTS BY WEIGHT OF SODIUM LIGNIN SULFONATE FOR EACH 100 PARTS OF UREA.
Claim 2
Dependent Claim
67 words
A HIGH WET STRENGTH PAPER CONTAINER FROM ABOUT 0.1% TO ABOUT 8%, BASED ON THE DRY WEIGHT OF THE PAPER, OF A THERMOSETTING LIGNIN SULFONATEMODIFIED UREA-FORMALDEHYDE RESIN, SAID LIGNIN SULFONATE-MODIFIED UREA-FORMALDEHDE RESIN BEING PREPARED FROM BETWEEN 1.8 AND 2.0 MOLES OF FORMALYDEHYDE FOR EACH MOLE OF UREA AND BETWEEN ABOUT 5 TO ABOUT 20 PARTS BY WEIGHT OF SODIUM LIGNIN SULFONATE FOR EACH 100 PARTS OF UREA.
References Cited (Backward Citations)
US2266265A
Cited
US2228567A
Cited
US2325302A
Cited
US2387619A
Cited
US2243481A
Cited
US2352922A
Cited
US2338602A
Cited
US2402469A
Cited
US2354514A
Cited
US2456567A
Cited
US2501665A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-23 | 1956-06-23 | 1956-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-23 | 1960-06-23 | 1960-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-23 | 1964-06-23 | 1964-12-23 | $7700.00 | Window Closed / Lapsed |