US2478856A
Expired / Lapsed
US
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Method of recovering surface permeability of a porous body
Assignee: Battelle Development Corp
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Filing: 1948-06-10
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Granted: 1949-08-09
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Expires: 1968-06-10
Abstract
No abstract record available.
Inventors
- 👤 Wallace W Beaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:11
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/08; B; B22; B22F; B22F3/00; B22F3/10; B22F3/11; B22F2998/00; Y; Y10; Y10S; Y10S29/00; Y10S29/026; Y10T; Y10T29/00; Y10T29/47; Y10T29/49; Y10T29/49636; Y10T29/49705; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12153; Y10T428/12479; Y10T428/12993
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-08 | 1953-02-07 | 1953-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-08 | 1957-02-07 | 1957-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-08 | 1961-02-07 | 1961-08-09 | $7700.00 | Window Closed / Lapsed |