US2837436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concrete and cement
Assignee: Individual
•
Filing: 1954-08-10
•
Granted: 1958-06-03
•
Expires: 1974-08-10
Abstract
No abstract record available.
Inventors
- 👤 Jr Edward P Chapman
- 👤 John A Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:21
CPC Classifications
C; C04; C04B; C04B11/00; C04B11/28; C04B11/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
A CEMENT MIX FOR PAVING AND STRUCTURAL CONCRETES OF INCREASED COMPRESSIVE AND FLEXURAL STRENGTHS AND INCREASED RESISTANCE TO CORROSIVE WATERS, SAID MIX CONSISTING OF ANHYDROUS CALCIUM SULFATE FROM ABOUT 5% TO ABOUT 15% BY WEIGHT AND THE REMAINDER PORTLAND CEMENT.
Claim 2
Dependent Claim
40 words
A CEMENT MIX FOR PAVING AND STRUCTURAL CONCRETES OF INCREASED COMPRESSIVE AND FLEXURAL STRENGTHS AND INCREASED RESISTANCE TO CORROSIVE WATERS, SAID MIX CONSISTING OF ANHYDROUS CALCIUM SULFATE FROM ABOUT 5% TO ABOUT 15% BY WEIGHT AND THE REMAINDER PORTLAND CEMENT.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-02 | 1961-12-02 | 1962-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-02 | 1965-12-02 | 1966-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-02 | 1969-12-02 | 1970-06-03 | $7700.00 | Window Closed / Lapsed |