Patent US2828820A successfully refreshed from Google Patents.
US2828820A
Expired / Lapsed
US
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Novel compositions of matter and methods and steps of making and using the same
Assignee: Harvel Research Corp
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Filing: 1957-05-13
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Granted: 1958-04-01
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Expires: 1977-05-13
Abstract
No abstract record available.
Inventors
- 👤 Mortimer T Harvey
- 👤 Peter L Rosamilia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:55
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/24; C04B24/28; C04B24/30; C09; C09K; C09K8/00; C09K8/56; C09K8/57; C09K8/575; C09K8/5751; C09K8/5755
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
20 words
THE METHOD COMPRISING APPLYING TO AN EARTH BORE WALL STRUCTURE OD SLURRY CONTAINING HYDRAULIC CEMENT AND ACETONE-FORMALDEHYDE ORGANIC REACTION PRODUCT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-31 | 1961-09-30 | 1962-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-31 | 1965-09-30 | 1966-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-31 | 1969-09-30 | 1970-04-01 | $7700.00 | Window Closed / Lapsed |