US3240579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper saturated with resinous polymer
Assignee: 3M Co
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Filing: 1960-01-04
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Granted: 1966-03-15
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Expires: 1980-01-04
Abstract
No abstract record available.
Inventors
- 👤 Arthur H Ahlbrecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:49
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/14; C08G75/16; C08G73/00; C08G73/02; C08G73/0206; C08G73/0213; D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
124 words
AN EASILY AND CONTROLLABLY PREPARED SHEET MATERIAL HAVING EXCELLENT DRY AND WET STRENGTH, COMPRISING A PAPER SHEET SATURATED WITH AND REINFORCED BY AN INTIMATELY FIBER-CONTACTING FLEXIBLE TACKFREE SOLID RESINOUS SATURANT POLYMER IN AN AMOUNT EQUAL TO AT LEAST ABOUT 25% OF THE WEIGHT OF SAID PAPER SHEET, SAID POLYMER COMPRISING THE IN SITU-REACTED PRODUCT OF (1) AN N-ETHYLENE PHOSPHONPOLYAMIDE AND (2) A SECOND ORGANIC COMPOUND HAVING AT LEAST TWO REACTIVE HYDROGEN-BEARING GROUPS PER MOLECULE AND A LARGE NUMBER OF HYDROGEN ATOMS WHICH ARE NOT REACTIVE, SAID SECOND COMPOUND HAVING A MOLECULAR WEIGHT EQUAL TO AT LEAST ABOUT 100 TIMES THE NUMBER OF SAID REACTIVE HYDROGEN-BEARING GROUPS PER MOLECULE, SAID PAPER SHEET BEING ADDITIONALLY PROVIDED WITH A COATING DIFFERING IN COMPOSITION FROM SAID SATURANT POLYMER.
Claim 2
Dependent Claim
124 words
AN EASILY AND CONTROLLABLY PREPARED SHEET MATERIAL HAVING EXCELLENT DRY AND WET STRENGTH, COMPRISING A PAPER SHEET SATURATED WITH AND REINFORCED BY AN INTIMATELY FIBER-CONTACTING FLEXIBLE TACKFREE SOLID RESINOUS SATURANT POLYMER IN AN AMOUNT EQUAL TO AT LEAST ABOUT 25% OF THE WEIGHT OF SAID PAPER SHEET, SAID POLYMER COMPRISING THE IN SITU-REACTED PRODUCT OF (1) AN N-ETHYLENE PHOSPHONPOLYAMIDE AND (2) A SECOND ORGANIC COMPOUND HAVING AT LEAST TWO REACTIVE HYDROGEN-BEARING GROUPS PER MOLECULE AND A LARGE NUMBER OF HYDROGEN ATOMS WHICH ARE NOT REACTIVE, SAID SECOND COMPOUND HAVING A MOLECULAR WEIGHT EQUAL TO AT LEAST ABOUT 100 TIMES THE NUMBER OF SAID REACTIVE HYDROGEN-BEARING GROUPS PER MOLECULE, SAID PAPER SHEET BEING ADDITIONALLY PROVIDED WITH A COATING DIFFERING IN COMPOSITION FROM SAID SATURANT POLYMER.
Claim 3
Dependent Claim
19 words
THE SHEET MATERIAL OF CLAIM 1, WHEREIN SAID COATING IS A COMPOSITION BONDING ABRASIVE GRAINS TO SAID PAPER SHEET.
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) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |