Patent US2421902A successfully refreshed from Google Patents.
US2421902A
Expired / Lapsed
US
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Means of expanding pearlite and like substances
Assignee: Individual
•
Filing: 1943-08-31
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Granted: 1947-06-10
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Expires: 1963-08-31
Abstract
No abstract record available.
Inventors
- 👤 Neuschotz Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:52
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/02; C04B20/04; C04B20/06; C04B20/066; C03; C03B; C03B19/00; C03B19/10; C03B19/108; C03B19/1085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1311235A
Cited
US1648856A
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US748894A
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US920333A
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US920334A
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US1513622A
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US1666656A
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US1922448A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-09 | 1950-12-09 | 1951-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-09 | 1954-12-09 | 1955-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-09 | 1958-12-09 | 1959-06-10 | $7700.00 | Window Closed / Lapsed |