US2857657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of constructing a porous wall
Assignee: California Institute Research Foundation
•
Filing: 1956-01-16
•
Granted: 1958-10-28
•
Expires: 1976-01-16
Abstract
No abstract record available.
Inventors
- 👤 Jr Harry L Wheeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:17
CPC Classifications
F; F23; F23R; F23R3/00; F23R3/002; B; B21; B21F; B21F27/00; B21F27/12; B21F27/18; B23; B23P; B23P15/00; B23P15/04; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/16; B29C70/22; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/18; F01D5/182; F01D5/183; F02; F02K; F02K9/00; F02K9/42; F02K9/60; F02K9/62; F02K9/64; F05; F05D; F05D2260/00; F05D2260/20; F05D2260/203; Y; Y10; Y10S; Y10S60/00; Y10S60/909; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49336; Y10T29/49339; Y10T29/4981; Y10T428/00; Y10T428/12; Y10T428/12479
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |