Patent US4070213A successfully refreshed from Google Patents.
US2909417A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of single or multi-stage grinding rings or the like
Assignee: Bisterfeld and Stolting
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Filing: 1955-12-12
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Granted: 1959-10-20
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Expires: 1975-12-12
Abstract
No abstract record available.
Inventors
- 👤 Osenberg Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:45
CPC Classifications
B; B24; B24D; B24D18/00; B24D18/0009; Y; Y10; Y10S; Y10S264/00; Y10S264/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A HOLLOW CYLINDRICAL GRINDING BODY COMPRISING A PLURALITY OF CONVOLUTE LAMINATIONS OF FABRIC IMPREGNATED WITH A HEAT-SETTING SYNTHETIC RESIN, PREDERTERMINED LAYERS OF SAID FABRIC CONSTITUTING SPACED ZONES BEING COATED WITH A PLURALITY OF ABRASIVE GRANULAR PARTICLES AND OTHER LAYERS OF SAID FABRIC ALSO ACONSTITUTING SPACED ZONES BEING FREE FROM ABRASIVE GRANULAR PARTICLES, SAID LAST NAMED LAYERS BEING DISPOSED BETWEEN SAID FIRST NAMED LAYERS.
Claim 2
Dependent Claim
63 words
A HOLLOW CYLINDRICAL GRINDING BODY COMPRISING A PLURALITY OF CONVOLUTE LAMINATIONS OF FABRIC IMPREGNATED WITH A HEAT-SETTING SYNTHETIC RESIN, PREDERTERMINED LAYERS OF SAID FABRIC CONSTITUTING SPACED ZONES BEING COATED WITH A PLURALITY OF ABRASIVE GRANULAR PARTICLES AND OTHER LAYERS OF SAID FABRIC ALSO ACONSTITUTING SPACED ZONES BEING FREE FROM ABRASIVE GRANULAR PARTICLES, SAID LAST NAMED LAYERS BEING DISPOSED BETWEEN SAID FIRST NAMED LAYERS.
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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) | 1962-10-19 | 1963-04-20 | 1963-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-19 | 1967-04-20 | 1967-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-19 | 1971-04-20 | 1971-10-20 | $7700.00 | Window Closed / Lapsed |