US2568023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Free filtering asbestos and method of producing same
Assignee: Johns Manville Corp
•
Filing: 1946-08-24
•
Granted: 1951-09-18
•
Expires: 1966-08-24
Abstract
No abstract record available.
Inventors
- 👤 Walter M Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:31
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/10; C04B20/1055; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2936
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
A FREE FILTERING LOOSE MASS OF FLEXIBLE CHRYSOTILE ASBESTOS FIBERS WHICH ARE INDIVIDUALLY PROVIDED WITH 5% TO 25% BY WEIGHT OF A DISCONTINUOUS, HYDRATED AND INCOMPLETELY HARDENED THIN COATING OF HYDRAULIC CEMENT COMPOSITION.
Claim 2
Dependent Claim
33 words
A FREE FILTERING LOOSE MASS OF FLEXIBLE CHRYSOTILE ASBESTOS FIBERS WHICH ARE INDIVIDUALLY PROVIDED WITH 5% TO 25% BY WEIGHT OF A DISCONTINUOUS, HYDRATED AND INCOMPLETELY HARDENED THIN COATING OF HYDRAULIC CEMENT COMPOSITION.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-17 | 1955-03-19 | 1955-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-17 | 1959-03-19 | 1959-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-17 | 1963-03-19 | 1963-09-18 | $7700.00 | Window Closed / Lapsed |