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US1503211A
Expired / Lapsed
US
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Plaster board having hard and soft portions
Assignee: C F DAHLBERG
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Filing: 1920-03-26
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Granted: 1924-07-29
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Expires: 1940-03-26
Abstract
No abstract record available.
Inventors
- 👤 John K Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:07
CPC Classifications
E; E04; E04F; E04F13/00; E04F13/02; E04F13/04; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24521; Y10T428/24529; Y10T428/24537; Y10T428/249921; Y10T428/249924; Y10T428/249932
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) | 1927-07-29 | 1928-01-28 | 1928-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1931-07-29 | 1932-01-28 | 1932-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1935-07-29 | 1936-01-28 | 1936-07-29 | $7700.00 | Window Closed / Lapsed |