US2852397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-solid erasable writing medium and instrument utilizing same
Assignee: Individual
•
Filing: 1953-12-21
•
Granted: 1958-09-16
•
Expires: 1973-12-21
Abstract
No abstract record available.
Inventors
- 👤 Gerald A Goessling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:16
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/16; C09D11/18; B; B43; B43K; B43K7/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A WRITING COMPOSITION WHICH SIMULATES THE MARKINGS OF A CONVENTIONAL PENCIL LEAD CONSISTING ESSENTIALLY OF A STABLE COLLOIDAL DISPERSION OF GRAPHITE PARTICLES IN A LIGHT PETROLEUM OIL WITH SUBSTANTIALLY ALL OF THE GRAPHITE PARTICLES BEING LESS THAN 7 MICRONS IN SIZE AS THE PIGMENT AND SAID GRAPHITE PARTCILES BEING FROM 10% TO 25% BY WEIGHT OF THE WRITING COMPOSITION, A CARRIER COMPRISING A TAR-LIKE SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF TAR DERIVED FROM PETROLEUM AND BITUMINOUS DISTILLATE RESIDUE AND ASPHALT DISSOLVED IN A PETROLEUM THINNER AND OIL, SAID COLLOIDAL DISPERSION BEING FROM 60% TO 80% BY VOLUME OF THE WRITING COMPOSITION AND SAID CARRIER BEING FROM 20% TO 40% BY VOLUME OF SAID WRITING COMPOSITION AND SAID TAR-LIKE SUBSTANCE BEING FROM ABOUT 16% TO 32% BY VOLUME OF SAID WRITING COMPOSITION.
Claim 2
Dependent Claim
132 words
A WRITING COMPOSITION WHICH SIMULATES THE MARKINGS OF A CONVENTIONAL PENCIL LEAD CONSISTING ESSENTIALLY OF A STABLE COLLOIDAL DISPERSION OF GRAPHITE PARTICLES IN A LIGHT PETROLEUM OIL WITH SUBSTANTIALLY ALL OF THE GRAPHITE PARTICLES BEING LESS THAN 7 MICRONS IN SIZE AS THE PIGMENT AND SAID GRAPHITE PARTCILES BEING FROM 10% TO 25% BY WEIGHT OF THE WRITING COMPOSITION, A CARRIER COMPRISING A TAR-LIKE SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF TAR DERIVED FROM PETROLEUM AND BITUMINOUS DISTILLATE RESIDUE AND ASPHALT DISSOLVED IN A PETROLEUM THINNER AND OIL, SAID COLLOIDAL DISPERSION BEING FROM 60% TO 80% BY VOLUME OF THE WRITING COMPOSITION AND SAID CARRIER BEING FROM 20% TO 40% BY VOLUME OF SAID WRITING COMPOSITION AND SAID TAR-LIKE SUBSTANCE BEING FROM ABOUT 16% TO 32% BY VOLUME OF SAID WRITING COMPOSITION.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |