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US2740997A
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US
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Assignee: ERWIN HEUCHERT
•
Filing: 1952-11-01
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Granted: 1956-04-10
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Expires: 1972-11-01
Abstract
No abstract record available.
Inventors
- 👤 Gipslis Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:25
CPC Classifications
E; E04; E04H; E04H6/00; E04H6/02; E04H6/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1102792A
Cited
GB251400A
Cited
US2296413A
Cited
FR988383A
Cited
GB667735A
Cited
DE820965C
Cited
DE830697C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-10 | 1959-10-10 | 1960-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-10 | 1963-10-10 | 1964-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-10 | 1967-10-10 | 1968-04-10 | $7700.00 | Window Closed / Lapsed |