US2644781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lightweight panel and method of manufacture
Assignee: Johns Manville Corp
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Filing: 1950-02-25
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Granted: 1953-07-07
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Expires: 1970-02-25
Abstract
No abstract record available.
Inventors
- 👤 Smolak George
- 👤 Edwin F Dyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:06
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/34; C04B28/342; C04B2111/00; C04B2111/00474; C04B2111/00612
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
THE METHOD OF MANUFACTURING SHEET LAMINATES WHICH COMPRISES, IMPREGNATING A THIN DENSE SHEET CONTAINING CHRYSOTILE ASBESTOS FIBERS WITH AQUEOUS ORTHOPHOSPHORIC ACID OF 40-60* CONCENTRATION, FORMING AN INORGANIC SHEET LAMINATE INCORPORATING SUCH IMPREGNATED SHEET AND ANOTHER SHET CONTAINING A PHOSPHATE FORMING MINERAL, AND HARDENING AND BONDING THE LAMINATE UNDER HEAT AND PRESSURE.
Claim 2
Independent Claim
51 words
THE METHOD OF MANUFACTURING SHEET LAMINATES WHICH COMPRISES, IMPREGNATING A THIN DENSE SHEET CONTAINING CHRYSOTILE ASBESTOS FIBERS WITH AQUEOUS ORTHOPHOSPHORIC ACID OF 40-60* CONCENTRATION, FORMING AN INORGANIC SHEET LAMINATE INCORPORATING SUCH IMPREGNATED SHEET AND ANOTHER SHET CONTAINING A PHOSPHATE FORMING MINERAL, AND HARDENING AND BONDING THE LAMINATE UNDER HEAT AND PRESSURE.
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) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |