US3504644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bulletproof grating for armored vehicle air intake and discharge openings
Assignee: Dr Ing HCF Porsche AG
•
Filing: 1968-01-10
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Granted: 1970-04-07
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Expires: 1988-01-10
Abstract
No abstract record available.
Inventors
- 👤 Horst Schibisch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:31
CPC Classifications
F; F41; F41H; F41H7/00; F41H7/02; F41H7/03; F41H7/035; E; E06; E06B; E06B7/00; E06B7/02; E06B7/08; E06B7/082
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1736621A
Cited
US1911408A
Cited
DE756033C
Cited
US2364271A
Cited
US2361186A
Cited
FR1012492A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-06 | 1973-10-06 | 1974-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-06 | 1977-10-06 | 1978-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-06 | 1981-10-06 | 1982-04-07 | $7700.00 | Window Closed / Lapsed |