Patent US3447955A successfully refreshed from Google Patents.
US3447955A
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US
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Process for sealing cement concrete surfaces
Assignee: Shell USA Inc
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Filing: 1965-09-22
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Granted: 1969-06-03
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Expires: 1985-09-22
Abstract
No abstract record available.
Inventors
- 👤 Clifford V Wittenwyler
- 👤 John E Magee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:33
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B40/00; C04B40/04; C04B41/45; C04B41/46; C04B41/48; C04B41/488; C04B41/60; C04B41/61; C04B41/62; C04B41/63; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/4007; C08G59/4014; C08G59/4042; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2765288A
Cited
US3337606A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |