US3269889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asbestos paper containing carbon and method of making it
Assignee: Johns Manville Corp
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Filing: 1963-01-02
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Granted: 1966-08-30
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Expires: 1983-01-02
Abstract
No abstract record available.
Inventors
- 👤 Marsden C Hutchins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:18
CPC Classifications
D; D21; D21H; D21H13/00; D21H13/36; D21H13/38; D21H13/42; D21H5/00; D21H5/12; D21H5/18; D21H5/183
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
49 words
A HIGH BULK ASBESTOS PAPER PRODUCT CONSISTING ESSENTIALLY OF AT LEAST ABOUT 15% BY WEIGHT OF HARSH ASBESTOS FIBER HAVING AT SCHOPPER-RIEGLER FREENESS VALUE OF ABOUT 180 TO 560 ML., APPROXIMATELY 2 TO 10% BY WEIGHT OF RESIN SIZE, AND APPROXIMATELY 35 TO 80% BY WEIGHT OF PARTICULATE CARBON.
Claim 2
Dependent Claim
49 words
A HIGH BULK ASBESTOS PAPER PRODUCT CONSISTING ESSENTIALLY OF AT LEAST ABOUT 15% BY WEIGHT OF HARSH ASBESTOS FIBER HAVING AT SCHOPPER-RIEGLER FREENESS VALUE OF ABOUT 180 TO 560 ML., APPROXIMATELY 2 TO 10% BY WEIGHT OF RESIN SIZE, AND APPROXIMATELY 35 TO 80% BY WEIGHT OF PARTICULATE CARBON.
Claim 3
Independent Claim
75 words
THE METHOD OF PRODUCING HIGH BULK DENSITY ASBESTOS PAPER CONTAINING MAJOR AMOUNTS OF PARTICULAR GRAPHITE, SAID METHOD COMPRISING FORMING A DILUTE AQUEOUS SUSPENSION CONSISTING ESSENTIALLY OF AT LEAST APPROXIMATELY 15% BY WEIGHT OF REFINED HARSH ASBESTOS FIBER HAVING A SCHOPPER-RIEGLER FREENESS VALUE OF ABOUT 180 TO 560 ML., APPROXIMATELY 2 TO 10% BY WEIGHT OF RESIN SIZE AND APPROXIMATELY 35 TO 80% BY WEIGHT OF PARTICULATE GRAPHITE, THEN FORMING THEREFROM A WATER-LAID SHEET OF PAPER.
Claim 4
Independent Claim
75 words
THE METHOD OF PRODUCING HIGH BULK DENSITY ASBESTOS PAPER CONTAINING MAJOR AMOUNTS OF PARTICULAR GRAPHITE, SAID METHOD COMPRISING FORMING A DILUTE AQUEOUS SUSPENSION CONSISTING ESSENTIALLY OF AT LEAST APPROXIMATELY 15% BY WEIGHT OF REFINED HARSH ASBESTOS FIBER HAVING A SCHOPPER-RIEGLER FREENESS VALUE OF ABOUT 180 TO 560 ML., APPROXIMATELY 2 TO 10% BY WEIGHT OF RESIN SIZE AND APPROXIMATELY 35 TO 80% BY WEIGHT OF PARTICULATE GRAPHITE, THEN FORMING THEREFROM A WATER-LAID SHEET OF PAPER.
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) | 1969-08-29 | 1970-02-28 | 1970-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-29 | 1974-02-28 | 1974-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-29 | 1978-02-28 | 1978-08-30 | $7700.00 | Window Closed / Lapsed |