US2519622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protection of high surface xerogels
Assignee: SHELI DEV Co
•
Filing: 1949-06-27
•
Granted: 1950-08-22
•
Expires: 1969-06-27
Abstract
No abstract record available.
Inventors
- 👤 Raymond C Archibald
- 👤 Frank T Eggertsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:47
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/0052; B01J13/0069; B01J21/00; Y; Y10; Y10S; Y10S502/00; Y10S502/506; Y10S502/509
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
IN THE STEAMING OF A MICROPOROUS MINERAL XEROGEL, THE IMPROVEMENT WHICH COMPRISES ADDING VAPORS OF AN ORGANIC NITROGEN BASE TO THE STEAM TO DECREASE THE LOSS OF SURFACE OF THE XEROGEL CAUSED BY THE ACTION OF THE STEAM.
Claim 2
Dependent Claim
38 words
IN THE STEAMING OF A MICROPOROUS MINERAL XEROGEL, THE IMPROVEMENT WHICH COMPRISES ADDING VAPORS OF AN ORGANIC NITROGEN BASE TO THE STEAM TO DECREASE THE LOSS OF SURFACE OF THE XEROGEL CAUSED BY THE ACTION OF THE STEAM.
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) | 1953-08-21 | 1954-02-20 | 1954-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-21 | 1958-02-20 | 1958-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-21 | 1962-02-20 | 1962-08-22 | $7700.00 | Window Closed / Lapsed |