Patent US1812129A successfully refreshed from Google Patents.
US1812129A
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Calculating mechanism for adding and listing machines
Assignee: PORTABLE ADDING MACHINE Co
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Filing: 1927-10-07
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Granted: 1931-06-30
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Expires: 1947-10-07
Abstract
No abstract record available.
Inventors
- 👤 Glenn J Barrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:35
CPC Classifications
G; G06; G06C; G06C7/00; G06C7/02; G06C7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1934-06-29 | 1934-12-29 | 1935-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-06-29 | 1938-12-29 | 1939-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-06-29 | 1942-12-29 | 1943-06-30 | $7700.00 | Window Closed / Lapsed |