US2504579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic cement composition and method of making
Assignee: Individual
•
Filing: 1943-08-30
•
Granted: 1950-04-18
•
Expires: 1963-08-30
Abstract
No abstract record available.
Inventors
- 👤 Perl John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:19
CPC Classifications
C; C04; C04B; C04B18/00; C04B18/04; C04B18/18; C04B18/24; C04B18/28; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
23 words
A COMPOSITION COMPRISING WOOD PARTICLES EXTRACTED WITH AMMONIA IN SOLUTION IN WATER TO REMOVE AMMONIA-SOLUBLE SUBSTANCES, AND HYDRAULIC CEMENT COATING SAID WOOD PARTICLES.
Claim 2
Dependent Claim
23 words
A COMPOSITION COMPRISING WOOD PARTICLES EXTRACTED WITH AMMONIA IN SOLUTION IN WATER TO REMOVE AMMONIA-SOLUBLE SUBSTANCES, AND HYDRAULIC CEMENT COATING SAID WOOD PARTICLES.
References Cited (Backward Citations)
US256436A
Cited
US1153883A
Cited
US1016178A
Cited
US1259502A
Cited
GB155268A
Cited
US1471876A
Cited
GB321744A
Cited
US1802715A
Cited
GB396652A
Cited
GB476999A
Cited
GB453905A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-17 | 1953-10-17 | 1954-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-17 | 1957-10-17 | 1958-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-17 | 1961-10-17 | 1962-04-18 | $7700.00 | Window Closed / Lapsed |