US3081219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prevention of deposition of pitch in papermaking
Assignee: Rohm and Haas Co
•
Filing: 1960-02-10
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Granted: 1963-03-12
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Expires: 1980-02-10
Abstract
No abstract record available.
Inventors
- 👤 Thomas J Drennen
- 👤 Louis E Kelley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:02
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/02; D21H11/00; D21H11/02; D21H11/06; Y; Y10; Y10S; Y10S162/00; Y10S162/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A PAPER-MAKING COMPOSITION COMPRISING FIBERS FROM A SULFITE WOOD PLUS HAVING A CONTENT OF PITCH SUCH AS TO GIVE RISE NORMALLY TO A PITCH PROBLEM BY VIRTUE OF THE TENDENCY OF THE PITCH TO AGGLOMERATE AND DEPOSIT IN THE FORM OF PARTICLES OF CONSIDERABLE SIZE WHEN UNMODIFIED BY A PITCH-CONTROLLING AGENT, THE FIBER IN THE COMPOSITION CONSISTING EXCLUSIVELY OF CELLULOSE FIBERS, THE COMPOSITION HAVING A CONSISTENCY FROM 0.01 TO 6% AND CONTAINING AS A PITCH-CONTROLLING MATERIAL,, 0.005 TO 0.2% BY WEIGHT BASED ON FIBER WEIGHT, OF A POLYMER OF 80 TO 100% BY WEIGHT OF N-VINYL-2-PYRROLIDINONE.
Claim 2
Dependent Claim
96 words
A PAPER-MAKING COMPOSITION COMPRISING FIBERS FROM A SULFITE WOOD PLUS HAVING A CONTENT OF PITCH SUCH AS TO GIVE RISE NORMALLY TO A PITCH PROBLEM BY VIRTUE OF THE TENDENCY OF THE PITCH TO AGGLOMERATE AND DEPOSIT IN THE FORM OF PARTICLES OF CONSIDERABLE SIZE WHEN UNMODIFIED BY A PITCH-CONTROLLING AGENT, THE FIBER IN THE COMPOSITION CONSISTING EXCLUSIVELY OF CELLULOSE FIBERS, THE COMPOSITION HAVING A CONSISTENCY FROM 0.01 TO 6% AND CONTAINING AS A PITCH-CONTROLLING MATERIAL,, 0.005 TO 0.2% BY WEIGHT BASED ON FIBER WEIGHT, OF A POLYMER OF 80 TO 100% BY WEIGHT OF N-VINYL-2-PYRROLIDINONE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-03-11 | 1966-09-10 | 1967-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-11 | 1970-09-10 | 1971-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-11 | 1974-09-10 | 1975-03-12 | $7700.00 | Window Closed / Lapsed |