Patent US3795653A successfully refreshed from Google Patents.
US3795653A
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US
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Lightweight concrete and method of manufacturing it
Assignee: SUEDDEUTSCHE KALKSTICKSTOFF WERKE AG DT
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Filing: 1971-09-17
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Granted: 1974-03-05
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Expires: 1991-09-17
Abstract
Abstract LIGHTWEIGHT CONCRETE IS PREPARED BY PREMIXING AND COATING LIGHTWEIGHT FILLER PARTICLES WITH A MELAMINE FORMALDHYDE CONDENSATION PRODUCT CONTAINING SULFONIC ACID GROUPS AND THEREAFTER ADMIXED WITH CEMENT.
Inventors
- 👤 A Aignesberger
- 👤 H Rosenbauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:06
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B20/00; C04B20/10; C04B20/1018; C04B20/1022; C04B2201/00; C04B2201/10; Y; Y10; Y10S; Y10S264/00; Y10S264/07
Claims Analysis
Total Claims: 0
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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) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |