Patent US2486217A successfully refreshed from Google Patents.
US2486217A
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US
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Method and apparatus for expansion of fibrous mats
Assignee: Johns Manville Corp
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Filing: 1945-07-20
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Granted: 1949-10-25
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Expires: 1965-07-20
Abstract
No abstract record available.
Inventors
- 👤 Robert E Slack
- 👤 Lee M Hedges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:13
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/02; Y; Y10; Y10S; Y10S428/00; Y10S428/906; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB191419372A
Cited
US2107818A
Cited
US2081060A
Cited
US2244203A
Cited
US2247504A
Cited
US2214709A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-10-24 | 1953-04-25 | 1953-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-10-24 | 1957-04-25 | 1957-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-10-24 | 1961-04-25 | 1961-10-25 | $7700.00 | Window Closed / Lapsed |