Patent US1421888A successfully refreshed from Google Patents.
US1421888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for weatherproofing clay
Assignee: Individual
•
Filing: 1921-09-06
•
Granted: 1922-07-04
•
Expires: 1941-09-06
Abstract
No abstract record available.
Inventors
- 👤 William H Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:04
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5007; C04B41/5076; C04B41/5079; C04B41/52; C04B41/60; C04B41/61; C04B41/65; C04B41/70; Y; Y10; Y10S; Y10S264/00; Y10S264/39; Y10S264/43
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1925-07-03 | 1926-01-02 | 1926-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-07-03 | 1930-01-02 | 1930-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-07-03 | 1934-01-02 | 1934-07-04 | $7700.00 | Window Closed / Lapsed |