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US4813997B1 Expired / Lapsed US ⏱️ 0.0 years remaining

Method for regulating plant growth

Assignee: Ricoh Co Ltd
•
Filing: 1987-05-22
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Granted: 1995-07-18
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Expires: 2007-05-22
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Abstract

Abstract A process for increasing the rate of plant growth. Plants are treated with one or more acids, which are condensation products of glycolic and/or L-lactic acid. These acids also increase the concentration of chlorophyll, increase the rate of new plant formation when plants are propagated by tissue culture, decrease the amount of added nutrients required for plant growth, and protect plants against the toxic effects of salts. Certain of the acids are useful for increasing the rate of root formation in the plant. +RR The questions raised in reexamination request Nos. 90/002,306, filed Mar. 26, 1991 and 90/003,035 filed Apr. 27, 1993, have been considered and the results thereof are reflected in this reissue patent which constitutes the reexamination certificate required by 35 U.S.C. 307 as provided in 37 CFR 1.570(e).

Inventors

  • 👤 Alan M Kinnersley
  • 👤 Taylor C Scott
  • 👤 John H Yopp
  • 👤 George H Whitten

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 15:16
CPC Classifications
A; A01; A01N; A01N37/00; A01N37/12; A01N37/36; A01H; A01H3/00; A01H3/04; A01H4/00

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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) 1998-07-17 1999-01-16 1999-07-18 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2002-07-17 2003-01-16 2003-07-18 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2006-07-17 2007-01-16 2007-07-18 $7700.00 Window Closed / Lapsed

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