US3503302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mine roof supports
Assignee: HERBERT SCHULZE HEIMING
•
Filing: 1967-05-10
•
Granted: 1970-03-31
•
Expires: 1987-05-10
Abstract
No abstract record available.
Inventors
- 👤 Hermann-Josef Schulze-Heiming
- 👤 Herbert Schulze-Heiming
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:46
CPC Classifications
E; E21; E21D; E21D23/00; E21D23/006
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US901712A
Cited
US974189A
Cited
US2657028A
Cited
US2585389A
Cited
US2748799A
Cited
US2783773A
Cited
US2825240A
Cited
US3216201A
Cited
GB982978A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-30 | 1973-09-29 | 1974-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-30 | 1977-09-29 | 1978-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-30 | 1981-09-29 | 1982-03-31 | $7700.00 | Window Closed / Lapsed |