US2616801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Partially dehydrated chrysotile fiber and method of making
Assignee: Johns Manville Corp
•
Filing: 1947-09-20
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Granted: 1952-11-04
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Expires: 1967-09-20
Abstract
No abstract record available.
Inventors
- 👤 Marion S Badollet
- 👤 William C Streib
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:32
CPC Classifications
C; C04; C04B; C04B14/00; C04B14/38; C04B14/40; B; B01; B01D; B01D39/00; B01D39/02; B01D39/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
THE METHOD OF TREATING CHRYSOTILE ASBESTOS FIBERS TO IMPROVE THE FILTERING PROPERTIES THEROF WHICH COMPRISES, HEATING THE FIBERS U TO A TEMPERATURE OF 600-1200* F., MAINTAINING THE FIBERS AT SUCH TEMPERATURE FOR A PERIOD OF BETWEEN FIVE SECONDS AND THREE MINUTES, AND COOLING THE THUS HEATED FIBERS.
Claim 2
Independent Claim
47 words
THE METHOD OF TREATING CHRYSOTILE ASBESTOS FIBERS TO IMPROVE THE FILTERING PROPERTIES THEROF WHICH COMPRISES, HEATING THE FIBERS U TO A TEMPERATURE OF 600-1200* F., MAINTAINING THE FIBERS AT SUCH TEMPERATURE FOR A PERIOD OF BETWEEN FIVE SECONDS AND THREE MINUTES, AND COOLING THE THUS HEATED FIBERS.
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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) | 1955-11-04 | 1956-05-05 | 1956-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-04 | 1960-05-05 | 1960-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-04 | 1964-05-05 | 1964-11-04 | $7700.00 | Window Closed / Lapsed |